A Resource's properties and notes file can be edited by double-clicking on
the Resource entry in the Resources
View or by clicking on the "Open in Editor" button
on the Resources View
toolbar. Any changes will require you to save the Resource.
The Resource Editor will open in an edit window:
The Resource Properties Editor
You can edit the Resource's Properties in the Properties table.
You can keep notes for each Resource which can be edited by selecting the "Notes" tab at the bottom of the Resource Editor:
The Resource Notes Editor