Not been able to change the text size of the main menus
Why not? I've pointed you to the solution on how to look up through the files.
The solution is to find a certain (unique) keyword or phrase which will point you to the file to edit.
Next question is how to know what to look up for, what keyword to look at.
The answer is in front of you, it's your Browser. It allows to View Source of the page and View Image Properties. Viewing the source of the page, by text fragment you see on the page (menu titles in your case) you can look up the table's cell where this text is located (<td>). Any table cell contains "class" name which is found under the bb_style.css you use. Most likely this class will contain everything about this cell: font size, background-color, borders and so on.
Next move is to open .css file and locate the certain class by using a very native Ctrl+F combination ("Find"). Then edit it and save back to the forums folder.
Ctrl+F, Ctrl+C, Ctrl+V is the only keyboard combination you use on the way.
Is it a difficult science? For me it never was. Actually nobody even teach me that. Why would I need some teaching, if the knowledge is here already?.. Why should teach we every newbie coming here and giving all the same questions for 10+... years?..
Of course, you may think that it's much quicker to ask the software developers directly, and if nobody replies, stop using the software and change it to something else, and claim that nobody supports that free software and doesn't answer your questions.
But sooner or later, nobody will even type a letter to you for free. You get a free support here because it's truly open source. The word "open" is the key. If we would be Apple, Dell or Microsoft, you would wait for reply for months. But for your case, you don't need somebody to reply. It's already in your hands. It's open source, you can edit it thoroughly the way you want - but of course only if you KNOW how to do it, and you KNOW what you are doing it for.
- If you don't know how, then hire
the specialist who knows it for sure, like you do in any other area.
- If you prefer to learn on your own without paying to anybody, then learn it on your own
I am just a very open-minded person to help everybody. But even these days, I am starting to think that people became abnormally lazy and selfish. Then why wouldn't I do the same regarding myself?..
Ok, it's just one of the philosophical moods which sometime happen to me. Keep trying :)