You need to get tools.
Actually the closer himself. Pencil, screwdriver, pliers and drill.
We get to work.
Installation of the Dorma TS 92 B closer should start from the side where the loops are at the door. Make a note where the closer will be installed. Then you need to measure what is the length of the closer cylinder. It is necessary that you do not drill a hole deeper. This length must be transferred to the drill and put a mark. Thus, having reached this mark, you will not need to drill further. Now you can drill a nest.