There are three (3) tabs that attach the SmartLink Module to the Devilbiss IntelliPAP CPAP Machine. Image of SmartLink Module’s adjoining face. Also, there is a release button located on the same side as the oximeter and data cord connections. The top 2 ‘tabs’ and connector must be aligned first, then the last tab can be slid into place. If all 3 are aligned at once, the module will not attach properly. Typically, there will be an audible ‘clicking’ noise when the module is fully attached. Verify that all points are connected by lightly pulling on the module after installation. If you are receiving a “EA1 Module Fault Contact Provider” message on your IntelliPAP screen, your SmartLink module is not properly attached.