How do you tell a girl that you like them when they all ready know?
it depends on if you really know they know. just say it. but not ...at like any random time.
Just tell her directly. I have tried it once with a girl, she said when she was ready, i would be the first one to know. If you like the girl, then just say that she will be the first one to know when you are ready for a relationship. Then if the girl likes you, she would probably say that she will wait for you.
If you are ready to tell them, tell them. If they don't like you in that way don't cry about it because you shouldn't change your feelings for someone just because they don't like you back. In other words, if you are not ready to tell them that you like them just say, "I will tell you when I'm ready and when I know you can be trusted." And hopefully they will respect your wishes…
I'm a girl and a way that i would like a guy too let me know that they like me is by doing something sweet <3 or like just start talking too that girl and make conversations and once you feel ready just tell her that you have been starting too get feelings for her, or just simply tell her straight up.