Link and unlink Google Ads accounts to your Account Centre by clicking on your icon in the bottom left corner and choosing Linked Accounts. 

To link accounts, simply find the account in your Unlinked Accounts list (the search bar may be handy here) and click the (+) button. When you've selected all the accounts you'd like to link, click Link Accounts. If using Opteo as a team, you may need to click on your profile icon under Team Members and toggle account access on or off.

To unlink accounts, find the account you'd like to unlink in your Linked Accounts list and click the (+) button. When you've selected the accounts you'd like to unlink, click Unlink Accounts. 

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If you'd like to connect new Google Ads accounts to Opteo that aren't currently in your Linked or Unlinked Accounts list, see this help doc.