How do i log in on the help portal if i have used my google account to create my user?

It is not a option on the page to use my google account and if i just use my email and password in the login section i just get "this email and/or password combination does not exist" or something to that effect.

The help portal is separate from your D&D Beyond account; you will have to make an account to use the help portal.

This is intentional to allow people who have lost access to their accounts to still enter support tickets.