Set up a photobucket account.
When it asks you to select videos click that button and it will bring up the usual "open file" window.
From there you can go onto your hard drive and find and select (group select with control key) what you want then click open.
Photobucket will download them from your hard drive and from there you can select "generate image codes" click to copy them then come back to this site and paste them into your thread on this site....
easy peasy lemon squeezy ...
I can't believe I just said that - I am NOT a computer guy ...