LiveJournal offers two style systems to modify the way your journal or community looks. Style System 1 (S1) is controlled by overrides and the Custom Styles page. Style System 2 (S2) is controlled by the Customize Journal page.
All the options described below for customizing your journal also apply to customizing your community. In each case, once you are in the appropriate area, you should select your community from the "Work as user" box and click "Switch" before making changes. You must be the maintainer of the community to do this. Where a Paid Account is required, the community account itself must be paid.
USING STYLE SYSTEM 1
If you are using S1, information on customizing your journal can be found at
http://www.livejournal.com/support/faqbrowse.bml?faqcat=s1.
Basic S1 customization is controlled at
http://www.livejournal.com/modify.bml. On this page, you can select your journal style from a list of LiveJournal system styles. You can also select colors for your journal, either by choosing a pre-set theme or by entering a custom set of colors. Finally, this page is also where you can input overrides.
Tutorials on overrides and how to use them, along with some commonly-requested overrides, can be found at the HowTo journal,
http://www.livejournal.com/userinfo.bml?user=howto.
Paid, Permanent, and Early Adopter accounts can change the entire layout of the page and customize all the HTML by making their own S1 styles. If you make a new style, you must select its name from the dropdown list at
http://www.livejournal.com/modify.bml to use it on your journal.
If the only option you see on the Modify Journal page is the ability to select mood icons, you have set your journal to use S2.
USING STYLE SYSTEM 2
If you are using S2, information on customizing your journal can be found at
http://www.livejournal.com/support/faqbrowse.bml?faqcat=s2. S2 does not use overrides. If you are using S2 and you want to customize your journal in a way that your chosen S2 layout does not support, you have two options. If you have a Paid, Permanent, or Early Adopter account, you can create a custom S2 style. With any account type, you can switch back to S1 in order to use overrides.
ADDING A TITLE OR SUBTITLE FOR YOUR JOURNAL OR FRIENDS PAGE
You can also set a title and subtitle for your journal, and a title for your friends page, by visiting
http://www.livejournal.com/editinfo.bml while logged in. Scroll down to the section labeled "LiveJournal Options" and type in the title, subtitle, and friends page title you would like. (If you would like only one or two of these, simply leave the other box(es) blank.) The title and subtitle will appear in your profile, and the title and friends page title will appear as the title of your journal and friends pages. Not all system styles support this feature.
FURTHER READING
What is the difference between S1 and S2? Which should I use?
http://www.livejournal.com/support/faqbrowse.bml?faqid=173
How do I switch my journal between S1 and S2?
http://www.livejournal.com/support/faqbrowse.bml?faqid=168
Custom Styles (S1):
http://www.livejournal.com/styles/
Where do I go to learn more about S1 customization?
http://www.livejournal.com/support/faqbrowse.bml?faqid=138
How do I change the font used for my entire journal?
http://www.livejournal.com/support/faqbrowse.bml?faqid=12
Color Usage tutorial:
http://www.livejournal.com/users/howto/26423.html
Hexadecimal color codes:
http://www.livejournal.com/users/howto/28475.html
How do I make a custom S1 style?
http://www.livejournal.com/support/faqbrowse.bml?faqid=128
Customize Journal (S2):
http://www.livejournal.com/customize/
How do I customize my journal using S2?
http://www.livejournal.com/support/faqbrowse.bml?faqid=170
Where can I go to learn more about advanced S2 customization?
http://www.livejournal.com/support/faqbrowse.bml?faqid=172
Why is my Modify Journal page missing some options?
http://www.livejournal.com/support/faqbrowse.bml?faqid=174
How do I buy a Paid Account for somebody else?
http://www.livejournal.com/support/faqbrowse.bml?faqid=44.
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