When you have 1 in a yellow circle, it means that there is an unread private message from the ID you have mentioned. If you know the person, you can reply back via the text chat or ignore it because it may be a bot, but I doubt it since it used the full name. When you access the chat window, you will also have the possibility to add the person as a known friend in the contact list. Сlick Add and follow the instructions.
