First thing you should always do is PREP! This step is very important. This ensures proper adhesion. Clean well with a degreaser, wipe with a damp (water) cloth, then scuff sand any wood. Wipe again.
Gather your supplies. Spray bottle full of water, large paint brush (I prefer the large round cling on), a small detail brush for edges, a mixing cup, and 220 grit sandpaper.
One thing to remember when chalk painting fabric is you want to stain the fabric, not lay paint on it.
Water down your paint using a 50/50 ratio. Working in small sections, spray the fabric with your spray bottle. You want the fabric to be wet, not just damp. Then paint those wet sections with your watered down paint. Really work the paint into the fabric. Be sure to get into all the creases and use a smaller brush for the trim areas, avoid getting a lot of paint on the frame. Repeat this sequence until the entire chair has the first coat