Lightly touch tape on one top corner so that it barely adheres to wall, carefully adjust top of Window Mural to level marks and then lightly adhere tape on opposite side.

Double check your positioning. If you need to move the Window Mural, carefully roll the lightly adhered corners back and the tape should come loose from the wall fairly easily. Once you like the position press the tape locations hard in place to secure. Tape will bond permanently within hours.