Altering the Members Page

[nightmist]

To fit my theme better I need to alter the members section if possible. Basically I want to remove a few specific colums. I am thinking of removing the colums POSITION and DATE REGISTERED. However I may want to remove other columns based on how the result looks. I have attached a crude drawing of what I want to accomplish. anyone have any suggestions or can provide help as to what I need to edit. Thanks a bunch in advance!

My Site
hxxp:www.lanaholics.org [nonactive]
Specific Page
hxxp:lanaholics.org/index.php?option=com_smf&Itemid=35&action=mlist [nonactive]


Direct link to image above hxxp:lanaholics.org/index.php?option=com_wrapper&Itemid=88 [nonactive]