By default the email you use the first time to signup for your account is your login email for Jumper.
If you used a social login to create your account, then you login email is set to your social account.
At any time you can use either a combination of your login email and password to login to Jumper account or login via your connect Facebook/Google account.
To view and update your login email, go to Store > Settings > Business profile and scroll down to the "Account email" section. Change your email and click update.