If your referring to being on top then all I can say is practice! I couldn't get the hang of it at first, couldn't get a rhythm and it wasn't nice for either of us. I lost my confidence with it soon after and didn't want to do it much but he encouraged me to keep trying (obviously he wouldn't mind the practice if I improved)
I kept trying and usually we have the best sex with me on top

woo.
Try doing it to music, I find you naturally go along with it...just me? :P
And also i find it easier if he's sat up so he can kiss me, my neck, pull my hair a little...makes it all the more lusty and I get into it more
fun fun
Shweed