I have my ink refill and plunger etc. It did not come with instructions on how to refill the edible ink. Please help

Put the cap back on the hole where the ink comes out, make sure it is well sealed. Remove the plug on the top of the printer and slowely inject the ink. If you go to fast, the ink can end up coming out the in hole. I am assuming you do not have the Gold label cartridge as those are done a different way.