How to cash out coins in Gas app?

so here's gas app so it says you earned seven coins and then uh yeah how to cash out you just tap cash out and then you you added coins to your profile and then there is a queue uh to to the new poll so there are 12 polls you're answering some questions and then you earn coins for that so you can't buy coins on the gas app if you want to skip the weight you just then need to type in right friend and then uh you have uh 10 invites usually and then you just send invites to your friend and then you will see coins here it's not possible to buy coins