You can add those code on Jkreativ > Jkreativ Dashboard > Additional Style. But before that you need to change the css Selector with selector of the element that you referring to.
Jkreativ > Jkreativ Dashboard > Additional Style
For change the information on footer area, please go to Appereance > Widgets and you need to make some change on Footer 1, Footer 2 and etc as you need.
Appereance > Widgets