1) compliment her: tell her she looks great in whatever she's wearing
2) pay: that'll make it clear it's a 'date', not two friends chatting
3) casually look up and down at her. once a guy did the following and it was really hot: start from her feet and slowly go up, don't dwell on her boobs, just keep going up and then spend a few more seconds admiring her lips and finally her eyes. lock gazes and smile charmingly.
I promise she'll love it and there's no way she'll think you wanna be just friends with her!
hope it helped!
now, could you answer my question plz?