How to remove Read More?

Hello.
I’m currently making a blog using wordpress.org, and i stumbled across a theme called The Box which is awesome, however, it doesn’t show the full posts and has a Read More on a post. I attempted removing Read More, but the text isn’t formatted properly and it doesn’t show fully:
http://prntscr.com/biqem2
and it should show like this:
http://prntscr.com/biqf3k
I’m getting really desperate here, and if anyone could help, i’d kindly appreciate that.
Thank you in advance.