Switchboard textbox

[Matt Reed]

Hello, I'm fairly new to Access and am trying to work on some else's
project.
Most of the tables, queries and forms are already setup. I am trying to add
a Switchboard to make it a little more user friendly.

Now I have a Switchboard that opens with several buttons all working fine.
How can I add a textbox that shows the date of the last entry?
Also it would be helpful to have a different textbox showing the index
number of the last record?

When I and a textbox and set the source record to
=DMax("Date-","ReportingDate") I get #Error every time I open the form.

Thanks for any and all help.

Matt