Adding Wordpress plugins

How do I add plugins to wordpress?
I have another wordpress blog hosted elsewhere and it is easy to do.
However, I don’t think I have the proper info or access.

This is what I see in wordpress admin - :

Connection Information

To perform the requested action, WordPress needs to access to your web server. Please enter your FTP credentials to proceed. If you do not remember your credentials, you should contact your web host.
FTP Username
FTP Password
Connection Type
Connection Type FTP FTPS (SSL)

You’re either using DreamHost Apps (free service) or an Easy One-Click install. Neither lets you modify the installation, as it’s shared among multiple users. An Advanced One-Click or do-it-yourself installation puts the software in your own home directory where you can add plugins and themes.

Short version: You can’t with your current setup.