Upon loading the keystore, the user is presented using a alternative of addresses, as derived from the mnemonic held from the keystore (In the event the keystore has "variety":"mnemonic"). You could log in on the net Wallet using a keystore file, using the xPortal Application, employing a Ledger gadget, or https://socialioapp.com/story3802958/the-5-second-trick-for-multiversx-web-wallet