How much protein should I eat to build muscle and how often?

When cutting your aim is to maintain your muscle mass rather than increase it. It's very difficult to add muscle mass during a cut because you put your body into a catabolic state.

You should bring down your carbs and increase your protein. So if for example your daily intake is 40% 30% 30%, with the 40% being carbs, you should start to bring this down and increase the protein.

You should eat protein every 2-3 hours to make sure your body has enough and is not breaking down your muscles.