Don’t worry, your question is fine!
So, we work with Google Ad Manager by “managing” child accounts. Our main account is the parent account, and each user has to create a child account. When you click that “View request” button, you will be redirected to Google Ad Manager, asking to create a child account. That child account will be the one used by us to populate all inventory.
Now that you have that email, just click the button, and follow the steps. You only need a Google account. If you don’t have one (because you don’t use Gmail), take a look to this topic: