its hard to tell you HOW to do it, its more of a show-and-tell kind of thing.
Therefore I would recommend youtube-ing a video on massage. I am sure there are countless videos on it. You can rent a massage video at the library. You can stream movies on massage therapy on Netflix if you are subscribed customer. There are many video sources that you do not need to rely on a written response here.
Another thing to do is just simply ask her... do you like this.. does it hurt.. yadda.... if she likes it, then you are doing something right. If she does not like it, change.