[Bueno Theme] Showing full post instead of excerpt (and more)

I was wondering if someone here could help me with my site (www.metalgearinformer.com), which uses the Bueno theme. I tried asking in the theme’s support forum but have gotten no response.

The main issue I have is that the theme automatically displays excerpts on the front page instead of the full post. The situation I would like is to have it show the entire post, unless I use the ‘more’ tag in the editor. But at the moment it breaks posts off on its own and ignores the more tag.

I’ve tried looking for a solution myself, but the code of the theme doesn’t seem to have <?php the_excerpt(); ?> that I can change to <?php the_content(); ?>, which is the suggestion I see everywhere.

Another thing is font size: I would like the titles to be somewhat smaller and the text in the posts itself to be somewhat bigger. This would seem like a simple thing to fix, but because this theme is very scalable for different screens, there are many different font sizes so I don’t know how to properly adjust this for all the different views of the site.