Renden, I cannot customise anything anymore

My reden theme is blocked. Today I wanted to try to add the homepage featured, it adds the 3 box on the page. But now I cannot remove them or addit them. I have 3 useless box in the middle of the site ??

If I also try to remove the slider nothing appear. I also have lost my logo that was on the header and it doesn’t want to reappear. I tried to change the side of my sidebar, but nothing happen.

Anybody has already encountered that problem? Do you have a solution?

Thx you very much