Displaying Overall Information About an Object

Launch Workbench64.
Switch it to Runtime mode by clicking the ‘Runtime’ button in the very left of the ‘Home’ tab in the ribbon bar.
Switch to the BACnet Runtime provider.
In the tree, expand the ‘localhost’ root item and expand the content of the device in order to see objects which are provided by that device.
Find an object you need.
Right-click it and choose ‘View Property Sheet’. This will display a form with various tabs where you can get (and, for some properties, also change) the actual values of the chosen properties.
If the given textbox has a white background (not grey), it is writable. You can click it, write a new value, hit the ENTER key and confirm changes in order to write a new value.