N97 mini - How to sign your own applications?

Can anyone tell me how to sign my own applications for the N97 mini. I want to install some freeware that is unsigned but i get the certificate error.

I heard that the certificates are Imei number specific. Can someone please tell me a quick way to get the certificate or can please someone sign an application for me?

I will provide the Imei number. Thanks in Advance.
 
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