How do I print white letters onto a dark coloured garment?
You need to start in your graphics editor by making a box shape the same colour as the garment or a contrasting colour. You them insert your white letters into this box. Print off the sheet and cut around the box shape or as close to the letters as possible and then transfer to the garment. It is impossible to get just white letters using the transfer paper for this process you would need to have them screen printed which is a costly exercise. You could print out individual letters if they were large enough and you had patience to cut well around them and then transfer them on.