QR-codes are widely used to make transfers easier to use.
Tap + button, select Receive, tap My wallet address. QR-code contains your wallet address and is readable by all industry standard software.
Use Scan QR shortcut in + menu to create a transaction with predefined values.
For example, if you want to make a transfer to your HitBTC account, simply scan the provided QR-code with your Freewallet and enter an amount to send.
NOTE: The address changing is normal. It keeps your account 100% anonymous. You can use any of your previous addresses to receive funds.