Themes not showing up

I’ve been testing a theme (theme: Mimbo 3.0; child theme: collegegreen) at https://www.collegegreenmag.com/testblogg2.

I just installed wordpress at https://www.collegegreenmag.com, and tried to reapply the theme I’ve been testing at /testblogg2. However, after I activate the theme at https://www.collegegreenmag.com, the appearance of the site does not change and remains the default Kubrick theme. Any help on how I can get the theme changes to appear?

Thanks very much for your help. Please let me know if you need further information.