An email address is specific to an account, you may have already had an account on wyylde that still exists on the site.
To find out, request a password.
You can reset your password online by clicking on "forgot your password?" at the top right corner of the home page (just below the text field "password") or in the middle of the page on mobile.
You will then be asked to enter twice the new password you will choose.
If you want to create a second profile, you must assign another email address.