How did i get the red star ?

Because many of your myLot friends gave you a '+' rating.

I think we get stars everytime we pass a certain rank on the ranking list in mylot.com. Like me when I was still below 100, I don't have any stars yet, but as time goes by and my ranking landed over 100 I got the yellow 10 star. I am not sure how to get those stars, I haven't seen any explanations about them but all I know is that they are reputation point stars. It may mean that your are trusted or you are a good participant and had been choosen to share some best response comments. Happymylotting and congratulations.