Blogger Need Help!

So, all you bloggers out there...my takeover of the blogosphere is really being stalled by my singular inability to do one simple thing: insert a "read more" tag in my posts.

I do, as is readily seen, like to run off at the mouth quite often. It would help if folks (including me) didn't have to scroll through the entire body of a post, but could click on it if they want to read the whole thing. Simple enough, yes?

Er...no. Not simple to me. I've done a search under the help feature and found the info that I need - just insert some conditional tags in the HTML of my style sheet. Problem is, where the devil is my style sheet??!??!

Little help, here, folks?