I am also desperate for help on this subject
Font size can be changed in the CSS code. Try using Firebug to identify which CSS code to change.
Also see this: http://codex.wordpress.org/CSS
If you need more specific help, you’ll need to post a link to your site.
I have the AJAX calendar on my WordPress site. I cannot read the text because it’s too large. A blue background line seems to not reach to each date box edge but squashes it up. I tried your suggestion above but I have no idea what you mean. Is there a simple way to make this readable?
http://www.clevelandunitingchurch.com.php53-23.dfw1-1.websitetestlink.com/wp-admin/admin.php?page=aec_calendar_options
My website is still in draft form, so you probably cannot see it. Any ideas?