I was granted access to Hammond BBQ forms and logged in through them in my new account but can't see anything. How can he share a form with me?

There are ways to share form with a user.

If you are a sub user of another account, then you can refer to this guide to know how to share form with sub account users:

https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User

If you normally want to share a form using the form url, then refer to this guide:

https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

If you need any further assistance, please let us know.