Edit Milk premium forum template

I use Milk premium template 3.3.0 to build my forum site, but meet some issues and do not know where to adjust.

  1. I edit the footer content “Powered by phpBB™ • Design by PlanetStyles” in file overall_footer.html under template, but it does not work.
  2. How to adjust the item from lower right navigation, btw adjust the amount items in drop-down menu.
  3. Where could edit this sentence “A short text to describe your forum” under logo
  4. How can i edit the title and add description for my site? I only see it shows “mysite - index page”.

Anyone know how to change or adjust these things, thank you so much.