Header menu font

I'd like to make a header menu font bold, to make it easier to read. Could you give me instructions, please?

 

Hello,

Go to js > custom.js present in your theme directory and remove the code given below

Code:

//Font Replace
Cufon.replace('#menu ul li a',{hover: true})('#colRight h2')('.reply',{hover:true})('h1')('h2')('h3')('h4')('h5')('h6');

Now,
Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

#menu li a {
font-weight: bolder ! important;
}

This will solve your issue.

 

It looks good, thank you much!!