Before you sign up
Use the e-mail address your game or channel already shows
SteamRadar finds your games and channels by the contact address they list in public. Sign up with that same address and confirm it: everything that lists it is attached to your account by itself — no claim, no code, nothing to post.
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SteamThe support e-mail on your game's Steam store page (Steamworks → your store page → Customer support).
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YouTubeThe business e-mail on your channel's About page (YouTube Studio → Customisation → Basic info → Contact info).
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TwitchThe e-mail in your Twitch bio or in one of your panels.
A different address works too: you can claim your game or channel later from My games, with a code we e-mail to the address it lists.