To see the properties of a decide shape it must be the active selected shape. This selected decide shape will have a border, as seen in the picture in the tutorial
To select the Decide shape you need to click on the big blue diamond at the top of the shape and the properties window will show decide properties
To select each rule shape, click on each rule box, the background of the rule should change and the properties window will show rule properties
It should not be a permissions problem, you have already created the orchestration file. Even if the file is read only it will allow changes, just prevents you saving the file.