open /arcade/skins/skin_Arcade.php (or skin_v3Arcade.php if you are using this style) and search for
Code:
<td align="center"><a href="./member.php?$session[sessionurl]&u={$score['mid']}">{$score['name']}</a> ({$score['ip']})</td>
and replace it with
Code:
<td align="center"><a href="./member.php?$session[sessionurl]&u={$score['mid']}">{$score['name']}</a></td>