Layout-manager with highlighted Add button
When you are in Layoutmode, you can add a plugin to the layout by clicking on the Add button of the layout-manager.
Now the Plugins window appears. On the left you can see a list with all the available plugins. Select one of them by clicking on the name and a description of this plugin will be displayed in the right part of the window. To add the selected plugin to your layout you only have to click on the Add button.
Now the plugin has been added to your layout and you can configure its initial settings right away in the appearing configuration window. Of course you can change the settings any time later.
Please see these pages for further information on the configuration of each of the plugins' settings: