Why not insert a drawing view first, so those fields won't be empty, then edit your sheet format?
You can drag out the bounding box of the textbox to define the area it can take. If you want to see text in the box, you can always use the $PRPSHEET:"custom property" method instead of using the link to custom property method, then, while you're in edit sheet format mode, the call for the property will show.
Make sure they're set to show. While in edit sheet format mode, press View > hide/Show Annotations and then select if there are any hidden notes/annotations.
Are you are trying to edit the sheet format while you have a part inserted in the drawing??
If it is, delete the part or assembly, then you can see where your property notes are.
Now if your trying to establish or change a sheet template than do this; create a dummy part that has all the property fields filled, with either letters or numbers then drop that part in the drawing and then edit the sheet format, now you can see where your text is and you can move it around for your best look, then delete the dummy part and save your drawing format and drawing template..