How to hide theme name from bottom of the blog

Hi, I am using Spacious theme. At the bottom of the page, I can see that it is always mentioned ‘Powered by wordpress. Theme: Spacious’ I know that a person can find out theme name any how and hack the site, if any one really wants to and there is no use of hiding this information, but this doesnot look that good for my readers and hence, I would like to hide this information.

Please guide me step by step as I am new to wordpress and also, I have no idea about coding. Thanks for your help in advance.