I have Gravity PDF installed on my website, but I can't log in to GravityPDF.com
Only users who have purchased a premium Gravity PDF product from the store will have an account on GravityPDF.com. If you are only using the free Gravity PDF plugin you won’t have (or need) an account.
If you are certain you have purchased a product from GravityPDF.com please open a support ticket, and we can attempt to locate your account.