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Prepare the paint, if necessary. Apply an undercoat, if necessary. Apply the first coat. Allow the paint to dry between coats. Apply additional coats.
If you are using regular latex paint to paint your upholstery, you will need to amend it. This means adding textile medium to the paint so that it sticks to the fabric. Mix together one part paint and two parts textile medium in a jar. This will thin out the latex paint and allow it to bond with the fabric. If you are applying paint to vinyl upholstery, you may need to apply an undercoat that helps the paint stick to the vinyl. This is only necessary for certain paints, so look at the directions of the paint you bought to make sure. The undercoat may be applied with a brush or from a spray can. This varies depending on the specific product you are using. Spray or paint on the first coat. Depending on the specific directions supplied on the product you are using, your first coat will either be very thin or thick enough to cover up the previous color of the upholstery.  If you are painting vinyl, you want to be focused on a smooth, streak-less coat that does not drip. This is usually done by applying thin coats. If you are painting fabric, your first coat is likely to soak in a lot. You may not have complete coverage but just make sure that the entire surface has paint applied to it. It is important to let your paint coats dry completely between coats. This assures that the paint solidifies and sticks to the surface you are painting correctly. It also assures that subsequent coats dry quicker. Follow the directions on the paint container for dry times between coats. Each paint may take a different amount of time to dry. Put on more layers of paint until the surface is covered to your satisfaction. This may be only one more coat, or it could be numerous additional coats. Be patient and do as many coats as it takes to get the finish you want. Skipping additional coats can lead to a less polished finish or a shorter lifespan for the paint.