Usually you have to go to your profile to make yourself "invisible".

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==>Profile==>Preferences==>Hide your online status :
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Why don't we put a checkbox in the loggin section so you don't have to go to your profile to update it?

Well, its impossible as of right now. Thanks anyways.

Yup, it's impossible. So you'll have to do it manually. I think the problem is now solved.

Yea. Imma mark it as solved.
Thanks for reminding me.
==> Marked as Solved

Your welcome. That's what I would have done if I was Moderator!