This guide requires you to have already connected Amazon Alexa to your WIFIPLUG account. Not yet set this up? Please see this guide on how to link your WIFIPLUG account to Amazon Alexa.
Open the Amazon Alexa app and login to your Amazon account.
Open the navigation panel by tapping the 3 lines in the top left corner and go to the 'Smart Home' section. From there, go to the 'GROUPS' tab.
Press 'Add Group' then choose a name from the list or enter a custom name in the name field. Once you have decided on a name, press 'NEXT'.
Select which Amazon Echo device you would like to add the Group to as well as the devices you would like to add to the Group. When you're happy with your configuration, press 'SAVE'.
To control your new Group say "Alexa, turn on [Group name]" or "Alexa, turn off [Group name]".
Step 6 [optional])
You can also control your Group from the Amazon Alexa. To do so, tap the Group you wish to control in the Amazon Alexa app and press the 'ON' or 'OFF' button.