Hey @GregH, welcome! This is a very fair question, here is the process outlined step by step:
- Open AI Studio, select the Setting button in the bottom left
- Select the “Plan information” button
- Select “Set up billing”, this will open up Google Cloud which is where we do billing
- Select “Link a billing account”, if you don’t have an existing billing account listed there, then open “Manage billing accounts” in a new tab (since you will need to come back to this page).
If you do have a billing account, select it from the drop down and then select “Set account” and you are all done! 
- If you need to create a new billing account, select “Create account” in the top right hand corner
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Work through the create billing flow, after you submit and create the billing account.
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Navigate back to the screen from step 4, and finish the flow through that step.
Please let me know if you run into any issues during this process!