Unable to buy gems

I would like to buy gems so that I can buy some armor. But I am unable to. I am a monthly subscriber.

How do I do that?


On a related note, I am considering the lifetime membership.
This gives a certain amount of gems.
But if I re-start and wand want to learn another code language, how can I buy gems in case I run out?

You can buy gems from the shop, and you don’t have to restart to learn a new coding language: you could change the language in the switch characters area.