There's really nothing special about it. You only write one sentence. It doesn't have to be perfect handwriting. Mine looked like a 6 year old wrote it.
As long as IO can read it, it's OK.
You can either use stylus or finger, whatever makes you more comfortable.
I didn't have to use eraser, but I'm pretty sure you could erase it. Please keep us updated. The important thing is, you can take your time writing it, no need go rush.
Good luck!