The signs stances starts with the feet close together. A good measurement is about hip width apart, but the feet can be closer together so that the heels are almost touching if possible. The catcher should be balanced and comfortable.
The right hand should be snug against the cup. It’s important that the hand is not too high or too low otherwise the signs might be seen by the opposing coach in either 1B or 3B coaches box.
The glove should be open and extended from the knee to further protect the signs from the 3B coach. The catcher should make sure that the glove is pointed straight out and not accidentally blocking the pitch signals from the pitcher.
The right knee should be pointed directly at the pitcher. If the right knee is open then the 1B coach might be able to see the signs and tip the pitches to the batter.
The legs should be pinched together as much as possible while still allowing the right hand to freely give the pitch signals. The tighter the legs, the better the concealment of the signals to prevent signs from being picked.
The image above displays what the standard pitch signals should look like. You can change things up with each pitcher (e.g. the pitcher throws a split finger and not a slider to the split finger is 3).
A few specific notes: