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The "Modules" page under the "Modules" menu gives you access to the list of modules. On this page you can install, uninstall, and configure each module. All the native modules are explained in depth in their own chapter, "Making the Native Modules Work". This chapter simply explains how the Modules page works.
Module notifications
Below the page title, you will at times get notifications from installed modules. Most of the time, the notification help you complete the configuration of modules that are installed but not yet ready to be used: updating their setting should make the notification disappear... and your module work properly.
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If the modules you have bought on Addons are not updating, do check that you are connected through this form!
Configuring the Native Modules
All the native modules are explained in depth in their own chapter, "Making the Native Modules Work".