carefully!
It might be best for you to take it to an archery shop or atleast have someone help you. You'll need to draw your bow back to your normal anchor point while someone makes a mark with a marker or chalk. You dont want to have to change your anchor point just to look through your peep! You'll also need to put a serving on each side of the peep to keep it in place.
Look it up on youtube! Keep in mind that a wide peep lets you see your pins better in low light! Good luck