This model can only be customized on desktop.

To customize, click the customize icon and it will take you to the customizer mode. The text and font size can be adjusted. There are additional controls for inner and outer diameter that should only be adjusted if there are issues with fitment.

Additional compatible stencils can be found below:

Star, Heart, and Clover stencils

https://makerworld.com/en/models/1214812-triple-golf-ball-spray-paint-stencil#profileId-1230444 

Halloween stencils 

https://makerworld.com/en/models/1823570-halloween-golf-ball-stencils#profileId-1946624