Can you tell me how I can tell if a font on your site can be used for writing on the Cricut machine?

Not sure what a Cricut machine is, but google gave me those results.
Using fonts in this software seems to be pretty much straightforward :

https://www.youtube.com/watch?v=OIrdSGGdGyM
https://www.youtube.com/watch?v=n-EHTGSE7vg