add this to your EXTRA.less template :
Code:
/*color text tab*/
.p-navEl [data-nav-id="forums"] {
color: #009688;
}
You can find the data-nav-id here :
/admin.php?navigation/
If you want to add a color to the mobile view, add this :
Code:
/*color text tab mobile*/
.offCanvasMenu a[data-nav-id="forums"] {
color: #009688;
}