Remove Underline from Style

Hello,
I am using the Enfold Health theme template for a website and the headings use two colors (green and dark gray). The underline style uses a green with no underline beneath the text, which is what I want. Somehow, I accidentally changed the style sheet today and I can’t figure out how to remove the underline. I go in the “Advanced Style” tab and select “<u>” for underline tags. I have set the font color to what I want and changed “text decoration” to “none.” However, the underline is still showing up. Can you let me know what I am doing wrong? It appears to change when I preview the site in Word Press. However when I log out and view the site, the underline still appears. Thanks in advance for your help.