It sounds like you are trying to edit a linked marker as these items would be grayed out in this situation. You have a couple of options.
1. Right click on the selected detail and choose "SET AS SOURCE MARKER". This will allow you to make those changes. When done, right-clicking again on this same marker will allow you to turn it back into a linked marker by choosing 'SET AS LINKED MARKER'.
2. If you want to find the source marker, right click on the detail in your view map select 'FIND LINKED MARKERS' click on the first one listed, right click and click on the GO TO SELECTED' button. This will take you right there. Select it and then you can edit the ID and NAME.
3. To be tidy, you can right click on the detail in the Project Map and rename it to match.
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
"Implementing Successful Building Information Modeling"