Newbie – Font Size in Posts

Hi,

I can’t seem to change the displayed font-size of my posts. I am using the dfblog template. I’ve tried switching to the HTML editor (I’m only a dabbler, so I prefer WYSIWYG) and inserting the <big> tag but it doesn’t make a difference. I was able to make some difference by editing the html for EACH PARAGRAPH with the <span> tag (I don’t even know what that really means…), but as my posts are pretty long, that was VERY tedious. Isn’t there a quick way to make sure the posts display in a larger font size???

Thanks