One of the items you need to enter in our settings screen is the private portion of your SSH keypair that matches the one uploaded to your cloud server provider.
Here are some things you should be aware of regarding those private keys:
If you generated your keypair with a MAC or WSL (Windows Subsystem for Linux) then do not use a password with it.
If you do add a password to the private key and you generated it using an Ubuntu machine, please make sure that you only use letter and numbers for the password. Certain special characters are interpreted by the Linux command line as BASH commands – it’s easier to stick to letters and numbers (upper and lowercase letters and number combinations are ok.)