I don't know about the PC blogs specifically, but whenever I've run into the missing-linebreaks problem in the past the solution has turned out to be HTML.

I've encountered "tame-HTML" sites where tags are optional and you can produce linebreaks in the finished post just by hitting Enter between lines. "Real HTML", though, runs lines together unless you explicitly tell it otherwise.

I'm guessing you're not that familiar with HTML or you'd already have tried it and, at worst, reported that it didn't work there after all. On that assumption, here are a few basic tags to try:

<br> single linebreak

<p> paragraph break -- almost the same as <br><br>

<i>italics</i>, <b>bold</b>

For fancier formatting you'll need the <font> </font> pair with the appropriate parameters for "face", "size", and "color". I found a pretty good introduction to those parts of HTML here: Basic HTML Tag Tutorial.

Can we see what you're blogging?
[Never mind, I found the link at your profile. Only, where do you register to comment?]
[Oh, and I notice you seem to have some HTML effects already available to you there...?]