Well. There are two options.
1. If you own a silhouette or cricut machine then the easiest way is to print the file on a full sheet of white sticker paper. Trace the stickers with the software provided by silhouette or cricut and cut the stickers. You can also use the .sil files that are included inside the zipfile.
2. The other option is pretty simple. Just print the files on a full sheet of white (sticker) paper and use a scissor or sharp cutting knife to cut the stickers.