How to add more origins to an existing pool

I am trying to add an origin server to my origins pool. When I click the add button it says I have to upgrade my Subscription

I went to billing → subscriptions page and there is no way to add more origin to existing pool on that page.

Could someone please let me know who to add more origins to existing origins pool

Finally found the most visible call to action button on the Cloudflare

(I still love Cloudflare)