Once you've claimed your username, you'll have to verify your account via the verification email sent to the address that you signed up with. 

The verification link is only active for 60 minutes and can sometimes go to your spam/junk folder so check there if it doesn't land in your inbox.

If you try to verify your account after the 60 minutes the link won't work but you can still get access to your account by requesting a password reset here: https://tryb.cc/auth/password/restore

This will take you to the password restore screen:

Enter the email address you used to sign up with and you will be sent an email with a link to set a new password:

Click on the link and set your new password:

Click on submit and you will be taken back to the Sign In page where you will be able to login with your new password.