My vendor is not listed. How do I install .ascm file

[jsteinberg48]

I just purchased a book, downloaded ADE on Mac OS/X 10.11.1 and my vendor is not listed in the pull-down (Prufrock Press).  How do I get around the error that the vendor is not listed?

Please, can someone help.  Chat support will not help.

Thank you.

[Nanaky]

By Vendor do you used Adobe ID. Then you enter the Data of the Account by Adobe.