At some time or another, you may find yourself in need of switching or disconnecting the Twitch account linked to your SOS profile.
You can achieve this by navigating to https://hero.tv and logging into the account you wish to disconnect Twitch from.
Click your profile picture at the top-right of the screen and proceed to click "Account". Then click "Disconnect" next to the Twitch icon down towards the bottom of the new menu.
Next, log into the SOS client with the account you'd like to link your current Twitch account to. At the main menu, click "Connect" towards the top, and follow the prompts. Enjoy! :)