To edit both horizontal and vertical fork/joins:
From the menubar, select Window > Show View > Properties.
Select the element from either the UML Navigator or Diagram view.
Edit the fields in the Properties view as necessary.
To rename both horizontal and vertical fork/joins, choose one of the following methods:
Using the context menu:
Right click on the element in either the UML Navigator or Diagram view.
Select Rename from the context menu.
Enter the new name.
Click Ok.
Using the Properties view:
From the menubar, select Window > Show View > Properties.
Select the element in either the UML Navigator or Diagram view.
Edit the name field in the Properties view.