From your DASHBOARD click to expand the PLUGINS menu.

Click PLUGINS.

This page will show you a list of all your installed plugins.

To ACTIVATE a plugin, use the ACTIVATE link.

Click ADD NEW.

To find more plugins, you can browse the WORDPRESS PLUGIN DIRECTORY, accessible by the link near the top of your screen.

To edit a plugin, go to the EDITOR in your expanded plugin menu, along the left side of the screen.

You can edit your plugins here, but note that this function is only for ADVANCED USERS, as editing here can break the plugin rather easily.

You now know how to manage your plugins in WordPress.

MANAGING PLUGINS IN WORDPRESS