No add credits button , only "cancel billing plan"

Welcome to the community @bertrand974!

bertrand974:

How do I add credits?

Try going to Home first. There you should see your Credit balance and from there you can click Add credits , which should take you to Billing.

You can also check this:

https://help.openai.com/en/collections/3675945-understanding-openai-api-billing-and-usage