calling old timers again  

Yes.
They can go here:
http://www.mylot.com/nr/cancel.aspx
to cancel their account.

They will lose any earnings and referrals that they may have acquired since joining.
If your friend rejoins make sure they use your referral link when signing up again!

Hi sritrinity,

You question had been answered by above response. I only want to add something here. If you friends already earn a few dollar from his/her current account, it is better for him/her to wait until he/she reach the payout. As you know once your account deleted all your earning will be deleted too.

But if he/she only made a few cent, he/she can do it as soon as possible.

This issue came up by a friend of mine when I first started on myLot. He could find no way to delete his account at all. I think maybe the only way to do it is to e-mail mylot.

Although I have to say that my friends account is still here though, even though he hasn't been active for over a year. It is s shame because he built up a good rating and had many friends. Maybe one day, he will come back again though. I don't know why he wanted to delete his account, but he must have had his own reasons. - Derek

Hi there! I do not think it possible. Let it go with the existing username, username is not going to make much difference in participation or for that in earnings.

the a/c can be deleted for sure
they will just lose earnings and discussions
but if they haven't made that much then it shouldn't make a difference