Metal Mouth Message Board

I got a hawley retainer for the top today and I had a little trouble putting in on in the office today, but they showed me how and it is suppose to click when you get it in right. Now i have tried for almost an hour and feels like i am not putting it in right. Can someone help me please.

I just throw it in the way it's supposed to meaning the wire towards the front, the top of retainer facing up and lower facing down and then press it in and up with my tounge and it fits like a charm