The Letter "N"
To form the letter "N," form the letter "M," but instead of placing your thumb three fingers down, place it two fingers down, so it's in front of your middle finger, but before your ring finger.
The Letter "O"
To form the letter "O," make a circle with all of your fingers.
The Letter "P"
To form the letter "P," take your pointer and middle finger and make a peace sign, with your thumb touching your middle finger. Keeping that form, flip your hand upside down.
The Letter "Q"
To form the letter "Q," make a fist, but exclude your thumb and pointer finger. With your thumb and pointer finger, form a rectangular shape, so that the two fingers are level with each other. Make sure the tips of your thumb and pointer finger are pointed towards the ground.
The Letter "R"
To form the letter "R," lower all your fingers, but your pointer and middle. Cross your pointer and middle finger, like it's for good luck.