If pup is peeing in the wrong place... you may be able to stop him. Move quickly towards him when he begins to pee and pick him up. Urgency is key here - you want to startle the pup just a little as you move towards them to pick them up, but you DO NOT want to scare the pup. You are redirecting your puppy to the right spot - not disciplining him. Immediately after picking him up, take him to the potty area and patiently wait. Most pups will finish there. Reward your pup with exuberance!
On the other hand, praising a puppy for doing the right thing works best for everything you will do in your life together. Make her think that she is a little canine Einstein every time she performs this simple, natural act. Be effusive in your praise—cheer, clap, throw cookies. Let her know that no other accomplishment, ever—not going to the moon, not splitting the atom, not inventing coffee—has been as important as this pee.
The most important thing you can do to make house training happen as quickly as possible is to reward and praise your puppy every time he goes in the right place. The more times he is rewarded, the quicker he will learn. Therefore it's important that you spend as much time as possible with your puppy and give him regular and frequent access to his toilet area.