Finally, put the embed link to the Video link area and press to the "save changes" button.
Besides that, you can define the video size and thumbnail image also from the player settings.
For embedding Vimeo videos just use the Vimeo embed link on the video link area. To get the embed link of a Vimeo hosted video, open the page and press to the "Share" button which is located on the top right of the player and copy the embed source link from HTML code.
The copied link should be like below:
And as a result, you will get a page with a video like that: