Hello Guys,
Ok so to start off I followed the getting started documentation and went ahead and installed Magento, which went nice and smooth!
Once the installation completed, I went to the admin dashboard which looks like this:

Now, I don't know why this is happening but I can't change the theme etc.. in the back-end! When trying to change it, the submit buttons do not work.
I have very little knowledge on server-side actions so be gentle with me 
I am just a guy that wants to set up a magento website to see if it is what I am looking for (and maybe design my own theme for it, for my business!)
EDIT: A little bit of information that may be useful:
I have a dedicated server with CentOS installed and WHM/Cpanel
Link to the website is http://mag.gamersapparel.co.uk
Thanks in advance for any help that I receive.
Cheers,
Jamie