You’re welcome! Glad I could help!
The “From Name” can be anything you want it to say. For example: “The President of the United States”.
But the “From Email Address” must be one of the authorized email addresses that has been added to your Gmail account. Gmail lets you authorize as many email addresses as you’d like, even if they’re not from the Gmail domain, and you can add them to your Gmail account. You have to prove ownership of the email address, and then you can use your Gmail account to send via those addresses.
You can also set the “Reply-To email address” and several other options as well.