what is this number which is infront of mylot users?,like i am 33 as an example

It is called as the user rating. It is the total number of discussions you have posted and number of discussions that you have responded to. If you start a new discussion or respond to some body else s discussion then it will increase.

This number is simply your rating, it rises with every discussion you reply to and, i think rises again if someone gives you a plus rating. However an alert i received said that if you reply to a duplicated discussion you will have your rating cut as that discussion will get deleted. So it may drop now and again too