Installing new theme

Hi guys,

My website http://www.colourfulrebel.com is running a WPzoom theme but it seems that it doesn’t work well. For example no new pluginns work, woocommerce will not work (showing my homepage on my webshop page and all).

So i wanted to install a different theme but when I do my whole website goes white.

Anybody have an idea?

Kind regards,

Bas van de Brug