You will have to click on the button present at the top right-hand corner of the Punch list dashboard to open the Manage Stamppop-up box.
This is shown in the screenshot below,
You can create stamps from this pop-up box and also edit existing punch stamps. You cannot delete punch stamp which are currently being used.
If you enter 'FC' in the text box named Stamp and enter Floor Cleaning in the text box named Stamp Title and click on the button then a Stamp will be created and will appear as,
From Manage stamp pop-up box you can create multiple stamps.
Note: A maximum of up to 3 characters can be entered as Stamp name.