The first thing I would suggest is to look through the theme's options. Many themes have options you can change, such as to display full posts instead of excerpts. I haven't worked with this particular theme, so I'm not sure what options are available. Many themes will create a new menu item within WordPress for setting different options for the theme.
If there aren't any built-in options in the theme for changing how the home page is displayed, then the next route would be to modify the theme. The preferred way to do this is to create a "Child Theme", which allows you to make customizations without changing the theme itself. That way you can update the original theme without overriding your customizations.
The file usually used for the home page is index.php. Sometimes you'll find there isn't a lot in there and it's pulling in stuff from other files via includes, especially with some of the "framework" type themes. If you can tell from the code what other files it's pulling in, it might point you in the right direction.
So I'd say explore the theme's options first and if that doesn't work, it may be necessary to make some customizations to how the the theme works.
Hopefully this at least points you in the right direction.