can i earn from tags ?

Put tags on every post you make, be it your own or a response. Tagging is important to put the post on it's approprite category, for a post to be noticed easily by other mylot members. You only get paid by posting, also by uploaading photos and from your referrals.

You will not earny anything for adding Tags to any discussion. Tags are only good to help getting more visitors into your discussion. Once you add a Tag, and someone Search for the same keyword, they'll find your discussion. Also, a list of Similar Discussions will be available at the bottom of the page (those are discussions who share the same Tags). Tags are very good if you want to receive some answers in your Discussion.

I do not think that you earn from tagging a discussion but I could be wrong. My earnings never change when I do or don't tag. So, I think it doesn't earn you anything at all but it helps to keep track of discussions here.

You will not earn anything putting tags in your posts. But the tags will help your posts to be recognized when certain words are typed or searched. It is good to always tag your posts.

I don't think so. I always respond to friends' discussions. Sometimes I tag, sometimes I skip.