The Genie Model GT90-3 uses a 12 switch remote like the two position block shown below. Matching the switches in the remote to the receiver sets your code.

Works with Genie 12 switch versions of garage door opener remotes on the 390MHz frequency.

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Set the twelve-digit toggle code switch to match the code set from another functioning transmitter. Access to the remote toggle code switch is achieved by removal of the back cover and battery (if necessary). Move switches using a small pointed object, such as a paper clip, gently switching the small switches to either the ON or OFF position. If your original transmitter had punch-out keys instead of switches, then set the switches in your new transmitter to the OFF position for the keys that were punched out.