This example adds a text box to the active document and then adds text to the text box.
Set myTBox = ActiveDocument.Shapes _
.AddTextBox(Orientation:=msoTextOrientationHorizontal, _
Left:=100, Top:=100, Width:=300, Height:=200)
myTBox.TextFrame.TextRange = "Test Box"
This example adds text to TextBox 1 in the active document.
ActiveDocument.Shapes("TextBox 1").TextFrame.TextRange _
.InsertAfter("New Text")
This example returns the text from TextBox 1 in the active document and displays it in a message box.
MsgBox ActiveDocument.Shapes("TextBox 1").TextFrame.TextRange.Text