Fullscreen theme and video post

Hi, I’m trying to use graphpresspaper.com’s “Fullscreen” theme.

In the install instructions, it says:

If you plan on using the built-in video player instead of the services listed above, you need to upload the FLV video to your server using either an FTP program (if the file is large) or WordPress’ media upload tool.

Done.

Paste the URL to where this FLV exists on your server into the field.

What field? The “Post video option” field? “Add video”?

Supply the width and height of the video in pixels in the appropriate fields.

In “Post video option” then?

And lastly, you must add a thumbnail for the video (the default image that shows up on the video player.)

Where? How?

Many TIA’s!