Location: Admin>>configuraton>>modules. Manage installed modules and their settings.
Your Moodle distribution will come with a given set of modules and developers are constantly making new ones. You may add or delete modules as follows:
To remove, click on delete next to the module you wish to remove. You will then need to use a file manager to remove/delete the actual module directory from moodle/mods, otherwise Moodle will reinstall it next time you go into admin>>configuration.
To add, simply use a file manager to copy the relevant directory into /mods and go into admin>>configuration and it will reinstall.
Configuring separate modules: