If you don't have a "global" button tool among your toolbars then
recover it
.
Click on the "global" button tool and draw the button by holding the left mouse key.
The
"Assign Macro" window
appears when you release the mouse key. Click on "Sheet1.LoadPostman". Click "OK".
Change the name of the button to "Load".
If the "Assign Window" does not appear then you were using the "local" button tool.
The "local" button comes into existence with a local private subroutine already assigned to
it. Find the code of this subroutine by making a right click on the button and
place a call to the Sheet1.LoadPostman into the code of the local subroutine.
Similarly, create buttons with names "Unload", "Send" and attached macros
"Sheet1.UnloadPostman" and "Sheet1.AddText".