Hey Harley
If you are worried about privacy just create a dummy email account using hotmail, yahoo or if your isp offers multiple email accounts, then do one there. Then create a dummy youtube account!
You can set the video to unlisted and this will mean that only people with the link will be able to view it. Hermanites will look at the video and then comment, they aren't going to post it to reddit!!! If you get the answer to your form question, you can then delete the video from youtube if you see fit!
Once you have your video uploaded, you simply copy the link and add it to your lifts or to a forum post.
For LIFTS:
This video is by scott. It is his Full body furnace video and the link is https://www.youtube.com/watch?v=aU8ayIGV3ow
After the ".com/" you see "watch?" simply copy "v=aU8ayIGV3ow" into the section that asks for a video link and then it will be created.
For FORUMS:
You simply hit the add video button which is next to the upload image button. You have the option to add the video directly, or embedd the video and youtube has share links and embedd code, You simply copy and paste like this:
And there you have it! a video attached to the forum!
For further help and advice, watch scott's video's on adding videos to your profile among other helpful tips: http://scotthermanfitness.com/siteWalkthrough.php and remember, someone may have already answered your question in this thread already, so read through the questions already asked!!!