upload my own template

or is there any ways to keep two side bar.. left and right.. insteadt one just one on the left i would like to keep another side bar..  for login in and chatting..

yes, you can modify the templates, even the layout by editing the CSS.   Head over to hackyour.lefora.com for tips

How do I sent out auto reply to new user to thank them?

Hey Kenny

Whenever a user creates an account on lefora or joins a forum an email is automatically sent out to them thanking them.  Currently you can not personally yourself send it, this may be a feature in the future.