Haven’t tested it, but this should force all the content (or at least most of it) to take over your themes font-size.
#bbpress-forums { font-size: inherit !important; }
div.bbp-breadcrumb, div.bbp-topic-tags { font-size: inherit !important; }
#bbpress-forums ul.bbp-lead-topic, #bbpress-forums ul.bbp-topics, #bbpress-forums ul.bbp-forums, #bbpress-forums ul.bbp-replies, #bbpress-forums ul.bbp-search-results { font-size: inherit !important; }
#bbpress-forums .bbp-forums-list li { font-size: inherit !important; }
Find this in your bbpress.css file:
#bbpress-forums ul.bbp-lead-topic, #bbpress-forums ul.bbp-topics, #bbpress-forums ul.bbp-forums, #bbpress-forums ul.bbp-replies, #bbpress-forums ul.bbp-search-results
Within that, there will be font-size: 12px. Change the pixel number to a higher value.
The bbPress.css will be located in your bbPress folder in your plugins. If you don’t have the bbPress.css in your theme, copy that file and put it into a folder called “css” directly with of your theme files.
@tecca can you explain more in depth what i should do if i don’t have the bbPress.css in my theme? Copy which file and where do it put it in my theme files? thanks for helping – i’m new.