@ Dunkinrunsonyou wrote:
I wonder how you would edit a new theme (css, functions,...) while having an other theme active.
Is it possible to do it parallel?
How would you do it?
From your WordPress Administration area, head to Appearance > Themes and click Add New. The Add New theme screen has a new option, Upload Theme. The theme upload form is now open, click Choose File, select the theme zip file on your computer and click Install Now