Unfortunately if you have an older unit there are no instructions for how to program a homelink garage door opener without a remote.
Programming corvette garage door opener without remote.
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You must use a remote to program it.
The homelink system does not have a way to set a code manually.
Press the learn button once which will give you 30 seconds to complete the next task.
Quickly and safely return to the vehicle or signal a helper to complete the next step.
Edit 08 beat me to it but yes it also depends on the type of opener it is.
Hold the button for 20 seconds.
This is typically next to the hanging antenna wire on the back of the motor.
Release the button as soon as the garage door moves within one second.
Press the button again to finish the programming.
Yes on the actual garage opener there is a discovery button that emits a signal you have to park your truck very close to the garage door press that button on the unit then run to your truck and program it.
Once you press this you must complete the next step within 30 seconds.
Find the learn or smart button.
Test your button to make sure the system works.
Go back to the garage to your door opener and push the learn or smart button that you located earlier.
The process is mostly the same.