Editing footer

Thank you so much for the Theme! since I installed customizr, I haven’t looked for another one.
The forum has been very helpful to me so far, even when I have very little knowledge with CSS. However, I still need some help.
I already created a child theme but I am having some difficulties getting it fixed. Your help will be appreciated and thank you very much in advance.

-I want to remove the “Designed by Themes.co” completely from the footer
– Is it possible to have two columns posts displayed on the front page and category pages?

Thank you so much ??