If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
An easy answer is to use the quick-CSS option and do the following:
color: blue; /* non-hover color */
color: yellow; /* visited link color */
color: red; /* hover color */
You can set these colors via the theme settings, but to get rid of underlines, you only need the following:
The topic ‘Remove Underline on Hyperlinks’ is closed to new replies.