Open Premiere Pro, then choose Window, Extensions, Earwig Sync+. If Premiere was open, quit it and open it again first.
The how-to sheet is in Applications: Earwig Sync for Premiere Read me.pdf. It covers signing in, matching your clips, importing the XML from your email, and what to do if something is not right.
Questions: Talk to Support in the Earwig app menu, or earwig.io/sync.