Simple VBA query

very new to writing in VBA but cannot seem to find answers for this online.

When a form loads, I have unbound text boxes which fill with details on a car in our fleet. I have written a very simple query just to check whether an Unbound text box contains a key word I'm after.

If cmbVehType.Value = "Van" Then Set txtCover.Value = "covered"

Can you write a query with an answer based on an unbound text box.

Cheers