When signing up for the RealVPN service, you need to enter an email address. You will be using it for login and will receive your password to that same address.
So make sure that the email address you provide is valid and can be accessed by you.
If you have signed up successfully but have not received any email with your login credentials, follow these steps:
Wait for up to 5 minutes after the signup for your email to arrive.
Check your junk, spam, promotions, and other sections of your email account. Activation emails are sent to many users, so they might be flagged for spam or similar.
You can get your password to be reset using the https://www.realvpn.io/reset_password/ webpage.