To sign up on Token Metrics, click on the Register button found in the menu.
Depending on the device you are using, you might not see the same layout - it's found in the menu section, though.
Next, fill in the required details to get yourself registered.
Make sure the email you've used in the process is correct - this is where the verification email arrives.
After verifying, you can go back to sign in and use Token Metrics.