If you mean "like" something someone said, over to the right of each post is the word like and you click that.Uh-huh! So I'm not the only hot head here -- a pleasure to have company!
BTW, how do I tag a person in a message? I can't seem to find the answer
If you mean you want to make sure someone sees your post, do the @ sign and their screen name. So I would do Serhiy Krykun . Then, up above in your ALERT area, if you drop down the box, depending on how you have your alerts set up, you should see that I tagged you. If you don't see that, then go to your name up to the right, hover your cursor over it and a drop down menu will show. There is a place called "Alert Preferences." From there, you can set what alerts you want to see. I hope this helps.