You can. The Bitcoin address that is listed on the ‘Deposit Bitcoin‘ menu is a bitcoin address that is specifically generated only for you and can be used several times. You may think of it as your temporary wallet. You can send Bitcoin to that address and your BTC balance in your Indodax account will increase accordingly.
But please note that Indodax is merely an exchange, not a wallet provider, which is why your Indodax’s Bitcoin address may suddenly change due to security reasons. We suggest you to use your own Bitcoin wallet to do daily transactions.