Renaming a SAAS Subscription?

First: I'm an idiot and I know that. This feels like such a stupid question but Google isn't helping me and every option I'm selecting either leads me in a loop or down a dead end.

I have a couple (3rd party, specifically Certify the Web) SAAS subscriptions in the Azure Portal. I was younger and dumb(er) when I created them and named them something not exactly the way they're currently being used, especially since I'd like to add seats to one of them which would move it even further from its current name.

To preserve what's left of my sanity I'd like to rename them to something more appropriate.... But how?

Or is renaming them once they're created just not a thing? If I have to delete the subscriptions and rebuild them it's not the end of the world but that feels last-resort-ish