Here’s a link to how to add font awesome icons to your menu. It saves memory because it doesn’t use a plugin and also looks professional.
I tried it on a DIVI website and had to add the following css. Keep in mind your menu id or class may be different. You may also have to play around with the parameters. Have fun!
/* FONT AWESOME */
#top-menu li {width: 120px !important;}
.fa::before {float: left; padding-left: 25px !important;}