Theme problems with Subscription template

Hi there,

I have just installed Word-Press and uploaded the “Subscribe 2” plug-in (https://www.skippy.net/blog/category/wordpress/plugins/subscribe2/). As to the description, I should now be able to access the subscribe.php file, which works but looks kind of strange:
https://www.merkli.com/toms-blogg/subscribe.php

Has anyone experienced similar issues and knows what’s wrong and how it can be fixed?

Thanks a lot for your support!

tom.