i want to de register my first life account

[Kizzani Ronzales]

how do i unregister from this site?

[Griffin Ceawlin]

I think (hope) you mean your Second Life account...

If you're thinking about canceling your account, consider leaving it active with a basic membership, which costs nothing to maintain. If at some point in the future you should choose to revisit Second Life, your avatar and your inventory will be here waiting for you...

Depending on the length of time during which you account was cancelled, we may or may not be able to restore your account. Even if we are able to restore your account, there is a chance that the inventory, land, and/or L$ previously associated with your account may be unrecoverable. If your account can be successfully restored, we will charge you a US$9.95 reactivation fee.

https://secondlife.com/my/account/cancel.php

More info: http://wiki.secondlife.com/wiki/How_do_I_cancel_my_account