The first thing you have to do is select which user icon you want to use. If you look at the top of the screen, you'll see that they're divided into categories ("LJ Users", "LJ Communities/Syndications", etc.), with "ALL Icons" as the final choice. When you open this page – http://DammitJa.net/lj/asmt – the default tab is "LJ Users" (because it takes a long time to open the "ALL Icons" tab, which used to be the only option before I split them up). Anyway, select the category you want to use, and then scroll down and select the icon you want by clicking the radio button next to it. In the example below, I have selected the "Harry Potter (Ravenclaw)" icon, in which the standard LJ user icon is holding a wand and wearing a scarf in the Ravenclaw colors:

After you have selected the icon you want to use, scroll down to the bottom of the page to enter the journal information. First, you can select which journal site you want your links to point to – livejournal.com is the default. You must enter the exact name of the journal or community you want to link to (in the example below, I used my own journal, "allah_sulu"). Note that if you're creating a link to a community, you should make sure that you use underscore characters
allah_sulu.
Arthur.

Once you have done all of that, the text box at the bottom of the page will be filled with the HTML code necessary to create the link you requested. Simply select the code and copy it (click and
