To manage plugins in WordPress, log in to WordPress.
Click Plugins in the left margin.
Click Installed Plugins.
This page will show you a list of all your installed plugins.
From here you can activate, edit or delete any of your plugins.
To add a plugin, click Add New.
A list of available plugins is listed.
You can find more plugins by browsing the WordPress Plugin Directory.
Go to the Editor to edit a plugin.
While you certainly can edit your plugins here, this is only recommended for advanced users.