Please select "administration" -> "access rights" and use the option "booking rights" to enter the desired booking authorization. Please note the following procedure:
Step 1: Select the area for which the new authorized person shall be able to book trips
Step 2: By clicking on "search" you can see all of the current authorized persons
Step 3: Click "add" (a link at the bottom)
Step 4: Search the person you want to add
Step 5: Click "add"
Step 6: Specify which travel services the person can book and click "add"