unable to edit css.php

hello! so far i love this theme very much & if satisfied with response i will make a donation! I have come across a few issues:

1. I want to edit the h1, h2, h3, h4, h5 & h6 tags so when I was editing my post/pages I am able to already have style sheets up. I see in css.php where I would he able to do this, but once I go into it & edit something and save the changes... the css file comes back empty and my whole site appears with no css attached. The only way to fix this problem is to re-drop the css.php file to replace it. Please help me with this problem! I do believe I have this problem with all of my files...

2. If you look at the website I have been working on www.carlragel.com on the page nav bar I have the word "blog" i would like to make that go to another link. (naturalpoolsandgardens.wordpress.com) - How would I achieve that?

Thank you so much in advance for your help!