You just need to add post content wrapper CSS to the code above, remove the old one and use this one:

#wpforo #wpforo-wrap .wpforo-post-content .wpfcl-a{color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a:hover{color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a:active {color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a { color:#008000; }
#wpforo #wpforo-wrap .wpforo-post-content a:visited { color:#008000; }
#wpforo #wpforo-wrap .wpforo-post-content a {text-decoration: underline;}

Worked perfectly, thank you for your support 🙂

Sidenote:

I rearranged the order to allow for the hover colour to be visible on a visited link.

eg:

#wpforo #wpforo-wrap .wpforo-post-content .wpfcl-a{color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a:visited { color:#008000; }
#wpforo #wpforo-wrap .wpforo-post-content a:hover{color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a:active {color:#008000;}
#wpforo #wpforo-wrap .wpforo-post-content a { color:#008000; }
#wpforo #wpforo-wrap .wpforo-post-content a {text-decoration: underline;}