⚠️ Controller accounts are deprecated. Your Stash account should be its’ Controller.
First, connect your account to the Staking dashboard.
Either from the "Overview" tab or "Nominate," you'll be welcomed with a warning announcing the deprecation of the controller accounts. Click on "Update Controller to Stash."
A new screen will appear where you'll see how the controller account would be updated from your current controller (1) to your stash (2) account.
That's it! You have now updated your controller account to your stash!