there should be a little button right next to where you add picture with a little movie icon on and on that you can choose add YouTube picture and search for clip (this is not html). the other way is to change the setting temporarily from "write" to "html" right above the white box where you write your posts and embed. hope this makes sense.. are you starting a blog too bro?
btw, did you check out my new J Dilla compilation on The Lost Tapes, if not I think you'll really like it - i put alot of lil' interludes from beat tapes and other releases between songs and all the songs are in great quality. it has some full songs that have been pretty rough to track down before, like the full version of "That Shit" with Tribe that has the Phife verse too at the end; Mos Def's "Can U See The Pride" remix in full and Big Tone's "Party Crasher" in full and good quality!