start with a modifiable pen
take out the ink cartridge and adapter
now you are done! now you say "it cant be that easy" well it's not there is a certain way to get the paper into the pen
the most you can fit in is 1/4th a piece of paper
fold the paper in half and roll it up from there
now you are done
for a more advanced message pen put the ink cartage back in the barrel and the paper around it.