How do I adjust my fonts so they are equal to my screen resolution?

I upgraded to yahoo mail plus. However, it indicated I change my screen resolution to 1024 x 768. I did this. Yet my fonts are so

small I can bearly see them. I would appreciate any help I can get with this problem.How do I adjust my fonts so they are equal to my screen resolution?
Click on View (main menu) and point your mouse to ';text size'; and choose a larger size.How do I adjust my fonts so they are equal to my screen resolution?
You can click tools, font size and change it from there.