First a warning:
Enabling SSH is at your own risk. If your actions result in your slot being inaccessible we will reset it for you, but we will not provide any other support. You will lose all your data once we do this. Using SSH is not recommended if you do not know what you are doing!

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You can toggle SSH on your slot by accessing the slot you want to enable it on, then scroll down to 'Advanced features' and click on the SSH header.

You can then choose to turn SSH on or off, depending on the current setting.