How do I get to billing manager

How do I get to billing manager please?

Do I need to register with fastspring?

Why make it so difficult. most companies have accounts where you can log in here I am just sent around in circles

or on the website at bottom of page, under support

That just takes me to fast spring. So do I need to register with fastspring I put my email in, I get sent a link that asks for my email that then sends another link. Hence just going around in circles.

Enter email. Go to link they send you. Account Manager for your account.