How to go from GPIO to digital signal?
GPIO means General Purpose I/O, and that's a digital input or output (though you often can assign an alternative function to it, like I2C signals, or ADC input). Digital outputs can control other devices by using high (logical "1") and low (logical "0") levels.

"enabled/disabled", both with the "d" at the end are terms which usually describe a status, and that will normally be an output of the device.

If it's indeed an input (which usually would be named "enable/disable", without the "d") then it's likely also a logic level input, which you can control with a second GPIO pin.