All Publer needs from you is a link to a Vimeo video.
Vimeo video URLs look like this: https://vimeo.com/134500633

There are two ways you can find the URL of a Vimeo Video.

1. Assuming you're watching a Video on Vimeo, simply copy the URL from your browser's address bar as shown below. That's the Video URL Publer needs from you.
    
2. Click the Share button inside the video and copy the URL inside the Link box next to Social Share buttons as shown below. That's the Video URL Publer needs from you.
    

Now you can go back to Publer, paste the URL you just copied into the Video URL field

and finish up your video post. You can either Schedule/Post the HD (High Definition) version or the HQ (High Quality) version of the Video. HQ videos are faster to process. Make sure that you're not violating any copyrights or Facebook Policies.

See how you can upload a Video directly from a URL, Facebook, YouTube, DailyMotion, Instagram or Vine.