1. Turn off the razor. Before attaching the trimmer attachment, make sure that the razor is turned off and unplugged.
2. Locate the trimmer attachment. The trimmer attachment is a small, rectangular-shaped piece with a round head. It is usually included in the box with your razor.
3. Align the trimmer attachment with the razor head. Hold the trimmer attachment in one hand and the razor in the other hand. Align the two pieces so that the tabs on the trimmer attachment fit into the slots on the razor head.
4. Press the trimmer attachment into place. Once the two pieces are aligned, press the trimmer attachment into place until it clicks.
5. Test the trimmer attachment. Once the trimmer attachment is attached, turn on the razor and test it to make sure that it works properly.