Thank you, @timmytation, for the assist and sharing the video link. 
@MeletisKonstas Since my Crafter never could read the registration marks, I actually did a print then cut without registration marks, at all.
1. Print your design outside the software
Print your image using another program (not inside the IS).
2. Upload the printed design into the software
Upload the same image file you printed into the software.
3. Remove the background
Use the software tools to erase or remove the background so only the design remains.
4. Add an offset
Create an offset around your design (this will be the cut line).
5. Place your printed sheet on the mat
- Put your already-printed sheet on the cutting mat.
- Align it in the top-left corner of the mat.
6. Match the mat position on the Make screen
On the Make (cut) screen, move your design so it sits in the same place as your real print—top-left area of the virtual mat.
7. Check the cutting area
Make sure the entire printed design and its offset are inside the cutting area (red lines) on the screen.
8. Cut only the offset
Send it to cut, choosing to cut just the offset shape (no printing from the machine).
9. Expect slight misalignment
On my Crafter, this worked better than using registration marks, but there was still a small misalignment—likely because my Crafter itself was off. It might line up more accurately on the iCraft, though.
You could test it out. If you do, let us know if it works with your machine. I would test with your usual sized sheet of paper first, in case it doesn’t align properly, you’re not wasting an A3 sheet of paper.