I got a publisher Id , and I tried to sign mysis file with the publisher Id (.cer and .key) ,

In the documentation it says like this

. Publisher ID
Publisher ID is a certificate used to assure you work for a company and you have the permission to represent that company. The cost of a Publisher ID is 200USD and it is valid for a year.
In Symbian Signed the Publisher ID is used to: 1. Verify your account, i.e., open access to the professional functions of the signing portal.

I couldnot find a link to verify my publisher Id in symbiansigned.com

and I tried to install the app , but the installation is not proceeding ,it gives certificate error