Tap the account switcher in the top left corner and you should see the option.
See my comment for a screenshot. I don’t know why I can’t seem to post a screenshot in the body of post. Every time I try it gets removed.
The sub includes more feature unlocks than just ad removal. The pro unlock doesn’t include user tagging anymore like it did for reddit for example.
If the subscription was $200/year, would you consider $250 for lifetime to be a deal?