If you want to send HBAR from your Xact Wallet.
Go to "Send HBAR" tile and enter transaction details:
Recipient address (it's the recipient account id, eg: 0.0.121121).
Amount: to send, in HBAR.
Memo: to add a note for this transfer.
Click "Send" button, you'll see a recap of your transaction and fees applying. Confirm, wait, and that's it!
Be careful: if you are looking to send to an Exchange (eg: Binance), you will have to enter a memo with informations this exchange give you. If you don't, your funds will be lost.