hi need help to understand why some contacts are green and some others are white. And, by the way, why some "stars" are with a green circle ? look at the image. many thanks
The "white" contacts have not yet been sent to the LoTW. Hover your mouse over the star symbol, and an explanation window will open.
When a contact is exported to LOTW it turns green. I think you'll find an option for that in your logbook settings. When a contact is confirmed via QRZ, you get a gold star. When it's confirmed via an LOTW import, you get a gold start with a green circle around it.