Using the mobile app to do some testing

hello guys, I want to look and fell the mobile hybrid version of my app, I followed the instructions and downloaded the Mendix app from the app store (Android). When I'm using the QR barcode reader a message with the following content appears “Tap three fingers on the screen to open the context menu”. I’m doing the above and nothing happens. (I’m not connected to my user from the mobile app)   Thanks. 
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