Sadzzz, you take the diaper/pull ups off during the day when you are at home. Put on a regular underwear. Then you take her to the bathroom every 15-20 mins first day (during the day). She may not "go" everytime and you don't want to spend too much time their either. Next day, you take her every half hour-45 mins.
When you sense that she is about to go for potty, you obviously stay longer. Place a stool under her feet. That makes it easier for them to apply force to their feet as that's what they are used to doing. Slowly they will learn to transfer weight to where it belongs (:D) Sorry for getting graphic here, please excuse this, but this is serious advice.
In 2-3 days, they begin to understand what they have to do.
Pull ups when you go out, and diapers at night only.
nikki said it all.:)