I cannot get the Add Existing Users by WPMU Dev to add users

I added the folder the wp-content/plugins folder via Filezilla in the CLCShare folder of my accont hostes on BlueHost but I cannot get the Add Existing Users by WPMU Dev. Adding Users with the Add New Users plugin works. Can you add multiple users on the same email or will I have to dream up emails. I would like to use the dummy data by WPMU. I would also like the best theme that resembles Buddy Press Social Please . Thanks

Thank you very much.