Alternatively, assuming you’ve got chrome ‘GTI’ badges, keep these on the car and get a set of red badge skins and apply onto the existing badges.
it looks like he’s asking how to stick them back on after somebody debadged the car
OP has posted recent pictures of their white GTI on the forum with GTI badges on the grille and tailgate. So, unless they’ve de-badged it and have had second thoughts and now want to put badges back on, it’s not debadged.
IMO badge skins would be an easier option than removing the existing chrome badge, cutting sticky tape to fit a used GTI PP badge and then attaching it in the correct location, although if the OP has already bought the badge, maybe they wouldn’t want to incur the additional cost of buying badge skins.