I'm not very good with Select Case statements, but open inc_func_members.asp and go to line 72. Starting there you should find the following code:
case "1"
if (fM_POSTS < cLng(intRankLevel1)) then Member_Level = Member_Level & strRankLevel0
if (fM_POSTS >= cLng(intRankLevel1)) and (fM_POSTS < cLng(intRankLevel2)) then Member_Level = Member_Level & strRankLevel1
if (fM_POSTS >= cLng(intRankLevel2)) and (fM_POSTS < cLng(intRankLevel3)) then Member_Level = Member_Level & strRankLevel2
if (fM_POSTS >= cLng(intRankLevel3)) and (fM_POSTS < cLng(intRankLevel4)) then Member_Level = Member_Level & strRankLevel3
if (fM_POSTS >= cLng(intRankLevel4)) and (fM_POSTS < cLng(intRankLevel5)) then Member_Level = Member_Level & strRankLevel4
if (fM_POSTS >= cLng(intRankLevel5)) then Member_Level = Member_Level & strRankLevel5
case "2"
Member_Level = Member_Level & strRankMod
Change that so it looks like this (red part added, striked part should be removed):
case "1", "2"
if (fM_POSTS < cLng(intRankLevel1)) then Member_Level = Member_Level & strRankLevel0
if (fM_POSTS >= cLng(intRankLevel1)) and (fM_POSTS < cLng(intRankLevel2)) then Member_Level = Member_Level & strRankLevel1
if (fM_POSTS >= cLng(intRankLevel2)) and (fM_POSTS < cLng(intRankLevel3)) then Member_Level = Member_Level & strRankLevel2
if (fM_POSTS >= cLng(intRankLevel3)) and (fM_POSTS < cLng(intRankLevel4)) then Member_Level = Member_Level & strRankLevel3
if (fM_POSTS >= cLng(intRankLevel4)) and (fM_POSTS < cLng(intRankLevel5)) then Member_Level = Member_Level & strRankLevel4
if (fM_POSTS >= cLng(intRankLevel5)) then Member_Level = Member_Level & strRankLevel5
case "2"
Member_Level = Member_Level & strRankMod
That ought to do it, but make a backup of your file (inc_func_common.asp) before you make the changes, just in case 