Add this to your custom css:
#one-page-nav li i {
height: 8px; /* height of circle */
width: 8px; /* width of circle */
border: 2px solid #fff; /* border color of circle, should match the background of the bar */
}
#one-page-nav li.selected a > i {
background: none repeat scroll 0 0 #222; /* active section circle color */
}
#one-page-nav li a:hover > i {
background: none repeat scroll 0 0 #222; /* color of circle on hover */
border-color: #222; /* color of border, should match color above, this makes the circle look like it has increased in size */
}
Hope I made that clear enough for you! Let me now if you have any problems
– Kyle