It depends on whether you use the Rich Text Editor or HTML tab when posting. This FAQ entry (http://www.livejournal.com/support/faqbrowse.bml?faqid=75) has instructions for both.
I find it much easier to use the HTML editor and put links in manually; I gather that the Rich Text Editor lj-cut feature may sometimes not work too well.
(Actually, I prefer to use a program called Semagic (http://semagic.sourceforge.net/index.html) for posting, which has many lovely buttons for those sorts of things. It's for Windows, though; if you use something else, I don't know if there are any similar programs available.)
When you are on the posting page, at the top are a bunch of "buttons" for various things to use in changing things like indentations, size and color of the text, etc. Count in the ninth button from the right. Hover your cursor over it and it will tell you that it's for the LJ cut. Highlight the text that you want under the cut, then click on that button. A window will appear. Type in the phrase you wish to appear in parentheses that people will click on to read your text, such as "Yoo-hoo, this way to the smut!" then click on the OK button (at least I think it says OK), and that's it.
Get Semagic (like Kribu suggested) - it makes posting TONS easier. I find it hard to post with cuts if I'm just using LJ's format for posting. Semagic gives you lots of options as well.
I'd never HEARD of Segmagic until this point - thanks, Jules for bringing up this topic - I've downloaded it and I'm getting ready to start using it for my postings, after I've figured it out a little bit.
I use Semagic, too. When I first set up my LJ I didn't know squat about HTML. I've actually learned more about it by seeing what the various tools in Semagic insert as I write my post. Love Semagic!
I, too, thank you for this post - I'd never heard of semagic either - I've just downloaded the zip version that doesn't require an install - you just save the unzipped files in a folder (I don't like to clutter up my registry unnecessarily) - and tried it out with a private test post - Perfection!
I saved it to my desktop -I'll put it elsewhere later - and to use, I just opened it and clicked on the LJ icon. Easy peasy!
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I find it much easier to use the HTML editor and put links in manually; I gather that the Rich Text Editor lj-cut feature may sometimes not work too well.
(Actually, I prefer to use a program called Semagic (http://semagic.sourceforge.net/index.html) for posting, which has many lovely buttons for those sorts of things. It's for Windows, though; if you use something else, I don't know if there are any similar programs available.)
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I saved it to my desktop -I'll put it elsewhere later - and to use, I just opened it and clicked on the LJ icon. Easy peasy!