New to K2. Where does one add vimeo URLs?

[NEARLY SOLVED]

I figured out how to add my own Vimeo URL link to media tabs on K2 items -- however, the largest video area seems NOT to have a K2 item associated with it, which is odd. So, this is largely figured out. Just a small problem (the largest video player) exists.

Hi all,

I am using a template I purchased from JoomlaXTC named Mozaix. It includes K2 Content Walls. One has a number of images stacked one on another. I was able to edit that wall without much trouble. However, the other wall contains 4 video players that link to Vimeo video URLs. I cannot figure out where to change the sample Vimeo video URL addresses to my own Vimeo URLs. When I run Inspector on the page, the only feedback I get is that the iframe wrapped around the URL is inline code. But I get no idea what document contains that inline code. It could be any number of .html or .php documents. So, I'm at a loss.

And, JoomlaXTC support is closed all weekend. So, if anyone could help, I would appreciate it.

Thanks!

Laurie