Yes, you state the obvious. It is perfectly clear that the next step is payment. My question was how to actually pay. There is no button saying “pay now”, or any other information about how to proceed. I also checked other account settings including billing information, but could not find anything.
I already attempted to send a screenshot along with the initial post in this topic, but this failed (error message by Discourse). Anyway, the transfer went through successfully, no further assistance is required.