If you want to transfer BTC to/ from xPortal, you can simply open the xPortal App, within the Home tab, “Wallet” section, click on BTC and in the lower side of the page, you will find the options to send, receive or buy. Please make sure to use the SegWit network.
If you select to buy, choose the amount you want to transfer and type in/ copy the wallet address where you want to send them. Be sure it is the right and supported network and the wallet address is correct.
If you select to receive, you will find a QR code that you can scan directly from the other wallet/ exchange or you can select the amount, supported network, and the correct wallet address.