Security and signing in
A second factor, a forgotten password, and what a sign-out does.
Step 1
Set up an authenticator on the Security screen.
Keep the recovery codes somewhere that is not this account.
Step 2
If you cannot sign in, use the reset link on the sign-in page.
A reset ends every session that was open before it.
Step 3
Sign out to end the session on every device of the account.
Still stuck? Write to office@managetax.ie and say which step you are on.