Push notification and pem file

[Hind Amer]

Hi everybody, 

this is the first time I implement push notification in my app so I need some help. 

I have created the .cer file then I get the .p12 file and also I generated the pem file now I am not sure were to add the pem file. I am creating chat app using XMPP in prosody server and I just what to know step by step how or where to use the pem file so I can connect my app with the server and get the notification to work.

when I try the simulator it is working fine but in the device I need to know where  or how to add pem file I think or if there is any other way please let me know the steps exactly. 

thanks in advance