Open your Alexa app and head to the Alexa Skills Store by opening the navigation panel and pressing the "Skills" button. Once the Alexa Skills Store is open, search for "WIFIPLUG" or click here to open the WIFIPLUG Skill in your browser.
Select the WIFIPLUG Skill from the list then press the "Enable" button. You will then be asked to login with your WIFIPLUG account. Enter the credentials you would normally use to login to the WIFIPLUG app, not your Amazon credentials.
Once you have successfully logged in, you will need to authorise Amazon Alexa to access your WIFIPLUG account. You will need to accept this in order to control your WIFIPLUG devices using Alexa.
After confirming the link to your WIFIPLUG account, you will be prompted with a message asking you to discover devices. Either press the "Discover Devices" button on screen or ask Alexa to discover devices for you. If the prompt does not show up for you or it disappears you can find it again by heading to the Smart Home section of your Alexa app.
The process of discovering devices can take up to 60 seconds.