No problem. Instead of using the box below, click on the "Reply" button up here in the upper right corner, that will take you to an advanced reply box.^^
Under the box you will see 2 options, a BETA version for multi-file uploads and another that just says "Click here to upload images and files!" I prefer that one myself. When the box pops up you can then upload shots from your computer.
If you want to upload a You Tube video to the site then click on the You Tube button above then copy and paste between the "][", a tricky little sucker to get in there at times.