Here I go requesting features that have already been added.
Happens all the time, no worries, we here to help
Can you please point me to the manual page where I can edit the info for one image and apply to all others?
Easiest way: right click selected thumbs and select Edit IPTC data and click F1 (standard Windows feature) to get the appropriate help page.
When multiple thumbs are selected, click Next after entering data in the IPTC edit and you will be asked if Apply to All etc.
Just as an aside, it's a good idea to explore all the context menus, much is done that way
Terry.