My printer is not signed in, I cannot print remotely

If "not signed in" means that it's not connected to your wifi network, check if your specific printer model is listed here:--> About AirPrint . Should be this case, follow the instructions provided by its manufacturer to connect it.

Shouldn't be this case, you can't use Airprint.

If you mean something different, please specify your needs better.

Regards

Giulio