November 2021 UPDATE:
Please note the content below may not reflect the new-and-improved Quadency trading experience launching in Jan 2022. This article will be updated by the end of the year, and you can read more about the upcoming changes here.
There are several ways to get to the Account Linking section:
1) From Linked Accounts section of Settings, where you can see and manage all your accounts and update a label if needed:
2) If this is the first account you are adding, you can also simply follow the prompts such as:
Clicking the button will start the Quadency Setup Tour, where you can select your exchange and enter your API keys: