Right now when the (small amount of) text scrolls off the bottom of
the box, it just scrolls off the bottom of the box.

I click in ther box and down-arrow to the bottom to view the rest.

Can I set it up so it starts to scroll up after it hits the bottom of
the box and I can then click in the box and up-arrow if I need to see
the first lines?

Thanks afforhand

Have you tried this ?

Sub RichText1_Change()
    With RichText1
        .SelStart = Len( .Text )
    End With
End Sub