How do I message the girl I like on snapchat?

there's a girl I went to school with and haven't seen her in over a year that I've been wanting to talk to lately, I liked her a lot back in school but I never talked to her and she also showed signs of liking me but I never knew for sure. So since she's in college now and I have no way of seeing her in person I decided the best way to reach out to her is through snapchat, but I'm not sure how to do this, do I tell her I liked her immediately or do i just start up a friendly conversation?
How do I message the girl I like on snapchat?
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