You won't be able to activate sn_hamp plugin by yourself. It must be activated by ServiceNow personnel from the ServiceNow store. So it won't be available in your instance and it can't be used on PDIs. If your goal is to practise HAM on the instance, you can use HAM simulator from nowlearning.
I did refer to this document but the issue is i am not able to see these plugins in my instance only... do i have to do any other work to get these pluguns
