Once you've created your account, you may still need to visit whatever link you originally received from the foundation.
This might mean returning to the foundation's website or landing page to start a new Application.
Or if you have a specific link in email to a draft Application, Outcome report form, etc. you would use that.
The GivingHub is not specific to a particular foundation. It is a portal you can use to manage the Application and Outcome forms you have begun, submitted, or been sent. This is why within the GivingHub you will not find a "Start Application" button; you have to refer to the webpage/link/email/etc. you have from the particular foundation you are engaged with.