Silhouette Studio is the software that comes alongside all Silhouette products and is pre-installed on one of the Innovation Lab's computers, though it is only available on a first-come first-serve basis. If you want to use it for yourself, Silhouette Studio can easily be installed from Silhouette’s website.
To cut a design, you have two options. The simple option would be to download pre-existing designs. The Innovation Lab has 100+ templates alone, and many can be found and downloaded from websites such as the Silhouette Design Store, though depending on the website, you will likely have to pay (albeit, usually less than $1 for one design). After acquiring a design, go to the “library” tab in Silhouette Studio (in the upper-right corner) and select the design. From here, you can alter the design as you please or try to print it directly. You can also drag in a JPEG, PNG, and DXF files into Silhouette Studio though which will be able to be cut, though you should also make sure you have permission to use the image before using them.
As a note, with the free version of Silhouette Studio, DXF files work the best as you can cut the interior of the shape as opposed to just the silhouette. Here is a link to a converter if you wish to use it.
If you don't want to or can't, the second option is to use the tools in Silhouette Studio. There are good tutorials for using all of the features on this page, but to summarize it: use the "line" and "shape" tools to create your ideal shape.
There are additional options on the top of the screen when you click on one of the shapes you created.
Following that are "group selected shapes" and "ungroup selected shapes."
The next four options are "bring to front", "send to back", "bring forward", "send backwards" which affect the positioning of objects if they are overlapping with each other.
This is followed by the "weld selected shapes into one shape" and the "offset" options.
On the right side there are also a number of features present too, many of which are similar to the features on the top row such as "offset" and "align." Others include adjusting font, color, the size of the mat, line thickness and other, more advanced options you will probably not need for most cuts. For more information, this video is a good resource for explaining all of the features of Silhouette Studio:
Make sure the files are .svg, otherwise it will not be compatible to print.
If you want to use Silhouette Studio for yourself, click the link to go to the download page or go to Silhouette America's website and find the page yourself. Afterwards, you will be able to download it, but if you want any new designs from the Silhouette Design Store, you will need to make an account on the design store.
Additionally, if you register a new Silhouette Cameo 4 with your account, you get 100 free designs to try out. The Innovation Lab has these free designs, so do not feel pressured to purchase your own Cameo 4 just to get access to these designs.