Blogging Trouble

I wanted a new updated look for my blog. I am not a computer person familiar with 'code'. I need help! I found a template I love but I can't access my dashboard again after logging out! I happened upon it back from an clicking back a thousand times to my edit page. Looking for help BADLY!!! What am I doning wrong? Also, the header is bigger without the top background as shown on their (The cutest blog on the block) website!!! I am feeling SO frustrated and afraid that I will not be able to access my blog to even get it bound at some point. HELP!