Complete the information in the form (all the fields are mandatory):
Create an item on the "IoT Hub" section and click on the link with the name of the item you have just created.
Click on the "Settings" section of "Shared access policies".
Click on "Add" button to assign the name and the permissions needed. Click on the name and a window will appear on the right with the "Connection String", which you will have to copy and paste in the configuration of your connector.