OK don't forget you will have to visit ifttt.com and sign up for an account.
Once you have signed in, visit ifttt.com/adafruit and click the Connect button to connect your IFTTT account to Adafruit IO.
You will be redirected to your Adafruit account page, and will be asked to authorize IFTTT. Click the AUTHORIZE button to grant access.
You will then be redirected back to IFTTT, and should see a Channel connected! message at the top of the page.
Next, navigate to your personal IFTTT Recipes page to start the recipe creation process.
Click the Create a Recipe button.
Click the blue this block of text to get started.
Click on the Adafruit channel.
Click on Monitor a feed in Adafruit IO.
Select the battery feed from the dropdown, and make the relationship less than the value of 10. Click the Create Trigger button when finished.
Then, click the blue that block of text to select what happens when the battery level is low.
Next, choose an action to happen when the trigger activates. In this example, we will be sending an email.
Select the send me an email option.
Enter the subject and body messages that you would like sent to you when the trigger happens, and then click Create Action.
Edit the recipe title, and click Create Recipe to complete the process.
Next. Repeat the same process for the door feed, but instead of monitoring for specific values, choose to monitor for Any new data.
Your recipes are now finished and waiting for door and battery changes.
You will then be setup to receive IFTTT emails whenever someone opens the door!