How do I potty train my soon to be 19 month old?

My daugher is 18 month and has about three more days before she turns 19 months. I wanted her potty trained by 18 months but I haven'tbeen consistent with the potty training. When I sit her on the potty I use the "potty" myself to try to demonstrate to her what she's supposed to be doing. Then, I would clap so she would know it's a good thing. However, this doesn't work, all she does is get off the potty, squat, and pees on the bathroom floor lol. Her father kneeled down in front of her a few times while she was on the potty and he pretended to be using the bathroom and eventually she passed gas, which was a good sign that she grasped the concept. So, my question is how do I get her to understand what she is supposed to be doing? What are some potty training techniques that you used for your child(ren)?