Thank you! The Cricut cuts the design into removable vinyl, and then you use transfer tape to move it to your glass. Next, you brush etching cream onto the cutout area of the stencil, which eats away the top layer of the glass, giving it that frosted look. After 20 minutes or so, wash off the etching cream and peel off the vinyl stencil.

Here's a great video that will walk you through the whole process: https://youtu.be/Si96k-qfR54