Hi @snozy86,

It allows to login using both Username and email address, so you'll just need to change the Username phrase from wpForo plugin settings. 

Please navigate to Dashboard > Forums > Phrases admin page, Find the "Username" phrase and change the phrase value to "Emal". It'll work fine. 

IMPORTANT: If you've done some change in phrases, please don’t forget to delete phrase cache in Dashboard > Forums > Dashboard admin page.

Thank you!