Gather your supplies:
The words 'mu other bags are Prada' printed on paper. Prada is written in the original type. Use a picture of Google.
Cut the paper in pieces if necessary. Turn the inside out and stick the letters with the tape on the bag. The letters are facing the wrong side of the bag. Make sure the letters line with the bag.
Turn it back, decide if it is the way you want it to be and draw the letters on the bag. Put the cardboard in the bag so the permanent marker wouldn't destroy the backside of the bag.
Colour the letters with the permanent marker. It is not a disaster if the letters are not as pretty as the should be but try to be as neat as possible. Make sure the a's, e's r's are (almost) the same.
Remove the paper and cardboard and your bag is ready to use!