Need API Key?

I’m trying to upload new fonts and I get this error:

This key doesnot exists in our record. May be it was old Free / Lite API key. Free / Lite key are deleted once they are used.

Please view this it shows my issue:

https://www.dropbox.com/s/4c9sumxp3dh3oz2/fontissue.mp4?dl=0

Do I delete the current key and get a new one? If so where/how do I get one?

The page I need help with: [log in to see the link]