Customizing Old Tape Theme

Hello. I am new to WordPress and have a VERY limited knowledge on coding of any sort. I need some help from those much smarter than me.

I used currently attempting to customize this Old Tape theme from a blog region to a website, I applied on my temp DJ website on http://www.jkmobiledjs.com/WP

There are 3 things I’d like to accomplish but not sure where to begin.
1) I can’t find the region and would like to type JK Mobile DJs in the tape instead of the default jkmobiledjs.com

2) I would like to remove either the sidebar or extend the orange post region. I would like more room to align pictures left or right and add text but this current format has me very limited on page area. I was able to remove everything from the sidebar but didn’t feel comfortable altering it on my own.

3) Lastly, I can’t find the region to either edit text the initial Home page or delete it. Hence the “Not Found”. I created another Home page to edit but it goes directly to the uneditable Home page.

Thank you for any help you can provide. It would be greatly appreciated!