Depending on the amount of moisture you sprayed on the surface you will now need to wait for the surface to dry. About 30 minutes to an hour is a reasonable time, depending on the temperature.
Once you are satisfied that the sticker is dry you can remove the application tape. Carefully start peeling back the application tape from the front top corner on a diagonal. If the sticker stays on the application tape instead of staying on the surface this means it is not yet dry enough. If the sticker does lift just push it back down with your credit card as you did before. If it is dry enough just slowly remove the application tape on a diagonal keeping your hand that is pulling the application tape close to the surface so the application tape is nearly folding back on itself. Once removed you can discard the application tape.