The “Mark Complete” is greyed-out by default until the lesson video has played until the very end – it’s a bit of a pain, but that’s just how our course software works. But you can achieve the same thing by just scrubbing the playhead to the end if you don’t want to wait for it to play out.

If the course videos are playing without sound, there’s an easy fix. Just mouse-over the video player, and look in the lower right hand corner for a ”bars” icon, like you’d see on a cell phone. This is a volume controller. Click on it and drag to the right and it should increase the volume.