You want to make sure your work area is dry, and you are in a position to see all the leaks plus remain safe. If it’s during the rainy season, you can identify the leak by the damp places on the ceiling. You might also spot mold or dark patches on the ceiling board. Do this with the help of your flashlight. If it’s daytime, you’ll probably see light penetrate through the holes. Once you’ve spotted the damaged areas, mark them with chalk.
The next step is to ensure the area is dry so that your roof tar can stick. Prepare a proportionate roof tar to the leak and smear it across the damage with a knife. After doing this, place a piece of plywood on the tar and spread more tar around the edges. If you want to reinforce your patch, use rubber on the outside of the leaking area.