To install an extension you need the manifest url of the extension
1. Open extension gallery from the waves
Or
Go to settings on the left side
and then choose extension settings
2. On the content (right column) find the extension installer and click install
the button status will change to UnInstall when it is installed
3. Now open a new wave and click on the right most end
4. Click on New extension installer
5. Enter manifest URL and click insert, confirm if it is asking.
