Supposedly you can post videos from Youtube, Vimeo and LiveLeak by clicking the Formatting button. However, I've not had much luck doing that. So what I do is to put my videos on Youtube and then grab the "embed" code when you click "Share" on Youtube.
Then tick the box in the upper left of the editor page that says "Message is in HTML Format". Then you can paste the embed code in your post.
However, when you do that you'll soon learn that hitting "enter" in your post doesn't get you a line feed. Instead you need click the Formatting button and then the Line Feed button.
Does that help?
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI