Steve,

What you're asking is quite straightforward, but makes me wonder what you're
trying to achieve.

In the button's OnClick event:

Dim strMyText
strMyText = "Here is my generic text."
Forms![YourOtherFormName]![YourControl] = strMyText

or if the text depends on another field on your 1st form:

strMyText
' The Case statement assumes MySelectorField is numeric
Select Case Me![MySelectorField]
    Case 1
        strMyText = "This is text for case 1."
    Case 2
        strMyText = "Case 2 text."
    ....other cases
    Case Else
        strMyText = "My default text."
End Select
Forms![YourOtherFormName]![YourControl] = strMyText

Sprinks

The code below on the On Click command of a button will work. Just put in the
right form name for Form2 and field name for txtLastUpdate. You'll probably
want to change the "Blah. Blah. Blah."

Note: The form in question must be open for this to work.

Private Sub Command0_Click()
On Error GoTo Err_Command0_Click

   [Forms]![Form2]![txtLastUpdate] = "Blah. Blah. Blah."
   
Exit_Command0_Click:
   Exit Sub

Err_Command0_Click:
   MsgBox Err.Description
   Resume Exit_Command0_Click
   
End Sub