In some regard, if there was a particular plate we needed to look at then we could always come to their website to acquire it. Adding to the database is an easy matter, but GymRatz's coding is different from mine, and he is much better at SQL statements than I am.
Two ways come to mind to do this. One is to allow editing within the DatagridView. Another way is to build a separate form to input the needed data, and have "Save" and "Cancel" buttons on the new form, along with textboxes for year/make/model/body/etc. A SQL insert statement would add the record into the table where VIN data is stored. Accessing the new input form could be via an "Add VIN" button, making the new form appear.