problems with Theme installation

Permalink
Hi, i'm a newbee with Concrete5.
I made a site with some free themes to build something as a demo possibility showcase.
Today i bought the morph theme and installed it.
At first i worked, byt was only visible on the main page. The other still where using older themes.

for some reason i decided to remove all the themes to again activate the morph theme i order to have it running on all pages..... then it went wrong.
At this point i have a site with no theme at all. I can't choose the morph theme since there no such anymore....(strange).

If i look at the add-functionality page, i can see the morph theme as installed, since i can only see a button edit.

Can anyone tell me how to activate the morph theme again ?
And how can i push it on alle pages ?