Log into switch and go to Extensions.                                                                                                                                Find the Extension that needs to be changed and double click on it. Go to Button Mapping and here depending on what need to be changed you will select the Programmable Key by double clicking and then click on the Type and change the function of the button, Label programmable key and then add the Value if needed. Once change is made hit apply

Save and make sure to notate the ticket number and what you did.

For in-depth over view of extension