I've lost track of what Kiev 4 is what, but check the bottom of your camera. If the bottom lock under the shutter release has a red mark by it, to rewind the film turn the lock so the edge is in a line with the red mark. That sets it so film can be rewound. If there is no red mark then there should be a button to push to allow rewinding. There is a pin on the side of the meter at the upper front. Push on it and the cover of the meter window will open. The film speed settings are in Gost which is basically the same as ISO, so set the correct film speed and then turn the ring beneath the rewind wheel until the meter's pointer is on the black diamond and read off the correct exposure.
Dick