you can withdraw cash from btc you have. if you have a btc you must also have a wallet to store btc then the wallet you use to save bitcoin you can use to withdraw cash if you have converted it into real currency. now many bitcoin wallets that you can use and each has a different way, therefore you should learn it before using it intact.
address of bitcoin wallet site:
- https://www.blockchain.com
- https://indodax.com/
- https://xapo.com/
- https://triv.co.id/id