1. Open your Premiere Pro project and go to the Timeline panel.
2. Move the playhead to the point where you want to add the marker.
3. There are 3 ways to add a marker.
   1. Keyboard shortcut: Press M on your keyboard.
   2. Marker menu: Click on the Marker menu in the top left corner of the Timeline panel and select Add Marker.
   3. Marker button: Click on the Marker button in the Timeline panel.
4. A new marker will be added to the Timeline panel at the current position of the playhead.
5. You can double-click on the marker to edit its name, color, and other properties.

Here are some additional tips for adding markers in Premiere Pro:

1. You can add markers to clips or to the Timeline itself.
2. Markers can be used to mark specific points in your video, such as the beginning of a scene, a transition, or a mistake.
3. Markers can also be used to create jump points, which allow you to quickly jump to a specific point in your video.
4. You can use the Marker panel to view all of the markers in your project.

I hope this helps! Let me know in the Comment Section if you have any other questions.