The SKULabs Print & Scale client does not use your SKULabs login. It uses a separate username and password that you copy from SKULabs. Think of this as linking your SKULabs account, not a user, to your Mac or PC.
How to sign in
Go to Settings > Printing as a manager or admin. Other users see "Ask your manager or admin." instead of the password.
Under Sign in to the print client with the following credentials, click the copy button next to Username and paste it into the client.
Click the copy button next to Password and paste it into the client.
The password is temporary and changes automatically every few hours, so always copy a fresh one from Settings > Printing right before you sign in. Don't save it for later.
If you see an error
Unauthorized: you most likely used your SKULabs login or an old password. Copy the username and password again from Settings > Printing. See Troubleshooting the "Unauthorized" error.
Child account not found or Authentication error - likely due to a duplicate printnode email: first uninstall any other branded print clients or the PrintNode software itself, since they can conflict with the SKULabs Print & Scale client. Then sign in again with freshly copied credentials. Do not change your users' email addresses to fix this.
If you still can't sign in, contact support in chat or at support@skulabs.com and include the username from Settings > Printing.
For setup steps, see How to set up the SKULabs Print & Scale client.