bbPress.org

Hey guys,

First of all, thank you so much for making this very cool forum plugin for everyone to use!
I do one question, and I’ve just spent a few hours studying the archives and looking for answers, but the thing is… I haven’t really understood any of them. I don’t know anything about child themes, I have no idea how to look for specific codes, although of course I am able to implement changes to a code once I’ve found it. I’ve tried looking for a plug-in for changing the font size, but failed.
Now, my question would be: Is it possible for somebody who knows close to nothing about the matter to actually do it? I’m running version 2.5.8. My WordPress version is 4.4.2.

My forum URL is http://lutrinians.com/forums/

All I can see under Plugins > Editor is:

Plugin Files

bbpress/bbpress.php
bbpress/license.txt
bbpress/languages/index.php
bbpress/index.php
bbpress/includes/index.php
bbpress/humans.txt
bbpress/templates/index.php
bbpress/readme.txt

Also, I am not using any programmes to edit the codes, just doing it in the browser.

Many thanks in advance!