Tools

The toolbar located under the creation section has tools to quickly change/apply effects to your rig. Every tool has a "shift + left-click" version.

All tools have a tooltip, just hover over the tool and wait for the tooltip to pop up telling you breifly what it does.

All tools require you to have a selection. If you have a selection made with the main menu's dropdown it will use that rig. Otherwise, if you have the dropdown set to "selection", it will use your current selection instead.