Linked accounts
Under Profile → Settings you’ll find “In-game accounts” — that’s where you enter your name per discipline (Steam ID, Riot ID, …).
Verified identity
Section titled “Verified identity”For providers TAP can actually verify, there’s a “Verify with …” button next to the field. It takes you through that provider’s sign-in and back. Afterwards the field becomes read-only and shows a green “Verified” mark, with a “Disconnect” button if you want to remove the link again.
Discord isn’t a linking field here at all — it’s a sign-in method (“Continue with Discord” on the login screen), not an additional verification in your profile.
Web vs. app
Section titled “Web vs. app”Verifying works through a redirect via the provider’s own sign-in page, so it only works in a browser. In the app, the field shows instead: “Open TAP in a browser to verify this with {provider}.”