How To: Change the Font Size on the Username in Postbit
 

To change the size of the username in the postbit, edit the postbit.css template:

Admin CP -> Styles & Templates -> Style Manager -> Edit Templates -> CSS Templates -> postbit.css

And change this:

Code:
.postbitlegacy .userinfo a.username, .eventbit .userinfo a.username {
clear:{vb:stylevar right};
font-size:{vb:stylevar font.fontSize}{vb:stylevar font.units};
font-weight:bold;
width: auto;
max-width:{vb:math {vb:stylevar postbitlegacy_userinfo_width} - {vb:math {vb:stylevar padding}*2} - 20px};
word-wrap:break-word;
}
To this:
Code:
.postbitlegacy .userinfo a.username, .eventbit .userinfo a.username {
clear:{vb:stylevar right};
font-size: XXyy;
font-weight:bold;
width: auto;
max-width:{vb:math {vb:stylevar postbitlegacy_userinfo_width} - {vb:math {vb:stylevar padding}*2} - 20px};
word-wrap:break-word;
}
...with XX being the font size, and yy being the units (such as 'px'.)