If you have the STL file of your own model on your computer, it’s probably the easiest to print via the Web App. You do this by visiting https://app.sculpto.dk/, logging in and then choosing “Print your own STL file” which is located in the top right corner. Then press “Upload” and choose the file that you want to be printed.
If you have the STL file in e.g. iCloud, you could print it through the app on your smartphone or tablet by choosing “Print your own STL file” which is located in “Printer” (the tab on the right).