Only two fields normally remain to be filled on that page, everything else is already pre-filled once your proposal has been accepted. The most critical information is in the Name fields, which must be a unique identifier for your target. It is recommended to put here a classical object name, followed by your initials and/or the target semester. Note that using an already used name is forbidden and will result in an error message.
The second important field is the list of your team, i.e., users that may retrieve the data (only the PI may upload targets, though). Select the user to add to your team from the drop-down box and hit plus to add her. Hit plus again to remove him again.
Next: Exposure time, etc.