If you don't get it this time you'll have to continue posting links the way you've been posting links.
On the right side of the screen when you're typing a post you see this:
What you want to post "click for Video" (or whatever words you choose) is the bottom line:
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For the part in the " marks, substitute lie link to the page you want. If it's a youtube video, get the link by clicking on share on the youtube page. You'll see a link beginning with htto. copy that and past it in the link we're discussing.
Where it says Link to Site, substitute the words you want viewers to read on the screen. In the case of a video on youtube, it would be something like Click here for Video.
Keep working at it un til you get it!