How to join a group on whatsapp?

[umar]

there is this group on whatsapp . i don't know whether i am in this group or not. its written that A has joined, B has joined (for example). i also sent in a message 'good morning' but that has not been delivered because there is only one tick mark and not two. so i don't know whether i have joined it yr not. pls help me to join it.

[Dushyant]

if you have joined a group then the group chat will appear in your chatlist. open the group chat below it's name will be the names of those who are the members of the group. Only the administrator can add you in the group.

For Ref - http://www.whatsapp.com/faq/