HI,
USe Plugin registraion tool for registring plugin.
copy and paste your plugin dll along with .pdb file in this location C:\Program Files\Microsoft Dynamics CRM\Server\bin\assembly
download the plugin registration tool.
extract and open the bin folder then debug folder .
double click on PluginRegistration.exe file
provide your domain name user name & connect
connect to your respective orginization
then click on register new assembly & browse the file that u have pasted in the location. select only .dll file
then register the step for on create on update.
regards,
Dyaman