You have done a better job at describing the graphic than you think.
Working from the graphic -
I think if you :
had a table called Bookings with fields Signing Out and BookingsID, and
could use the query designer and set up the grid as per the graphic
-checked the SQL View and ensured it showed UPDATE
- you would find your were missing a Form called Signings
- there would be 2 controls on the Form - txtOut and BookingsID.
I recommend you do a little googling and find some sample youtube videos on MsAccess bound forms and update queries.
I think that with your post count of 114, you have been through
this before.
Good luck.