Moving Seo & Url (Help!)

[Felipe_CN]

Hi everyone. So I was just trying to remove that "Developed by Prestashop" that appears below my website link when I share/post in Facebook and some people told me to edit "index" in "Preferences > SEO & URLS" but it wasn't working, that massage keep appearing. So I removed the item #4 (index) and add again, but it went to the number #36 of the list and now all my website front page is mixed. Can someone help me to fix it? I think if I only put index as #4 in the list it will fix, but I can't find where to change the position.

 

My website is www.corcelstore.com and I am using prestashop 1.6 Thank so much.