Please do not use the native iOS app of Amazon Alexa to install Conrad Connect skill, as this method is not yet supported. The best way to perform the installation is to do it via Amazon Alexa web app.
1. Open the following link in a browser and log in to your Amazon Alexa account: http://alexa.amazon.de
2. Go to the "Skills" menu and search for "Conrad Connect".
3. Press "Enable" button and provide the credentials to your Conrad Connect account.
Amazon Alexa allows you to start Do-Projects with your voice. The service cannot be used directly in the graphical rule (Project) editor as sensor or actuator.
To have a Do-Project executed by Alexa (e.g. a Do-Project named "Light"), just say "Alexa, connect to Conrad Connect", then " Please, execute Light". You can also say "Alexa, please tell Conrad Connect to start Light".