There are many ways to approach girls. The best way to start learning how to approach girls is by asking them for an opinion on something. For example: “My friend and I want to go abroad but we can agree where to go, so we need some advice from you girls… where can you recommend us to travel… and what’s good about that place?”
You can also ask for directions to some place… “Have you heard of a club called [clubs name], it’s suppose be a great night… but we don’t know where it is… have you guys heard of it?”
The more you try to approach the better you will get.