To create, edit or delete Comp & Void Reasons, firstly press the Menu button on the top left corner of your screen, then Items.  

1. Under Settings, select Comp and Void.

2. To create a New Comp Reason, click on the blue button on the right, Create Comp Reason.

3. A new bar will appear, simply write the New Comp reason's name and it will be added to the list of your comp reasons.

Note: You can change the name of any of your comp reasons by just clicking on their name and the new change will be automatically applied.  To delete a comp reason press the trash icon on the far right.