How??...
do I join this very nice family?
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It is easy ... you roll up your sleeves ... take a deep breath ... and hit this 
When you get in there ... you will be "backdoor user" ... so you need to hit the config button and change your handle ... if you don't do that the next family member can't use the link ... (if you get the page where it says "the handle is already in use" ... then change the "backdoor user" to your handle in the url field ... the url field is above the "name in use" page in your browser and there is the full addy to the chat page ... just delete the "backdoor user" and put in your handle then hit the enter button on your keyboard ... that will work too) ... if you get the "room is full" page ...well then there is nothing to do ... you just have to sit and wait ... just don't give up!!
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