1) Click on "Create", and then on "Points".
2) Click on pinpoint shape (with icon, the first one).
4) Click on "W" icon to choose your logo picture as an icon.
5) A panel is opened. Click on "New category" button and choose your image (your logo) in your documents.
6) Set your logo as you want (resize, crop...). And click on "Add" button.
7) Select your logo (click on it).
8) Your pinpoint has now your logo as icon!