Best practice is to check FAQ’s, I looked but i was no able to find specific instructions to change email address in Luck Scout.
From what I can tell (and I may not be right): Try going to your profile page, click Settings then general. You should see the option to update you remail. Make sure you save changes.
Also you can try to add email address to your Paypal account, Paypal allows you to have several email addresses saved to your account.
If you have tried and still are unable to fix it, you can try sending a message to the Luck Scout team, leave this as a last resort since they are so busy at it is.