Sorry for the problems Jer, we have your support email and will run a verification check, but it is likely you purchased directly from us so we can transfer you now to the Mac App Store version. Please give us a day or so for a reply directly back to you.
You should be able to find Preferences in the iReal Pro menu (or try command-comma).
In any case, please do a backup of your songs for security and archiving (this is either in the iReal Pro menu or File menu or in Preferences, Utilities).

Thank you for your continuing support of other users here at the forum and friendly comments
- from the iReal Pro team