You have to be confident, good looking, and just not care what they think. You have to be a narcissist like me and only talk about yourself. What I would do is dress fresh and go up to them smile and select which girl I want to talk to and just open up a conversation with the main group, then eventually start focusing on the one girl I was interested in.
Try to start a completely different conversation and see if they join in if it's something you have no idea what they're talking about. If you know the topic then join in. If you don't know then ask. Don't just not talk. I'm sure they'll be more than happy to inform you on what's going on if you show the interest. Maybe they'll show interest in you!
Make an observation about something before you go over there and say something scripted. And when you go over there don't talk to one girl talk to the group. It's all about building rapport and a connection. If you can make them smile or laugh then you are creating positive emotions in them and they will feel drawn and attracted to you. Also check out this dating coach in the video he has many more videos on this subject, will open your eyes and change your life.
If they're talking about something important I let them talk freely. If they're talking about something that I have something to say about, I say it. It depends on the girls and how much the subject of the conversation matters to me.
I would recommend How To Be A 3% Man ebook, it changed my life. And these types of worries are answered, check it out, it's by Corey Wayne. Great read, he has a youtube channel as well.
Just talk to each one of them withouth the intension to seduce them. And then ask the group if you can talk wit her private take her hand and move her to something quiet where you 2 can talk .
Select a girl, the one you think is the hottest. Then get rid of all the others one by one (or in groups, depending on your murdering skills). Finally go talk to the girl left alone.
if you want a tip just try and talk to one person and make them stand out from the others. tell her she is beautiful compared to her friends {instant jealousy} idk if it works because i dont approach groups either