What is the problem with my Fed4?

HI I am a starter with fed4 camera made in Russia.
I got my pic and found there's spots by light.
It's same almost all pics
I guess it's problem about leaking light.
But I don't know how to fix it.
Could you guys tell me what to do cuzco I like this camera so keep using it.

Help me!

Your first problem is it's a Fed 4. It looks like the other problem could be a hole in the shutter curtain. Take the lens off and open the back to see if you can see light coming through.

Oh I found some spots that can't seal light as you told! Can I fix it with just simply add some black seals?

This site has instructions. https://www.lomography.com/magazine/212016-how-to-repair-the-rubberised-curtains-of-a-shutter

I found a user manual at http://www.butkus.org/chinon/russian/fed_4/fed_4.htm so I now have a clue as to what you are using.
If you can see light through the shutter curtain then the curtain needs to be replaced or repaired. I do not know what products you have available to you.
I use Golden Heavy Body Artist Paint #1040 Carbon Black, http://www.goldenpaints.com/products/colors/heavy-body . I dilute it 25% to 50% with water then paint over the pin holes in 2 to 3 coats allowing the paint to dry thoroughly between coats with a fine bristle artist brush. This has worked best. The paint dries flexible and adheres to a wide verity of surfaces.
Any patch that makes the curtain too thick can cause other problems. Tape will not work.

Thank you so much for answer you guys ! Savers of my camera !!