To get listed in the member rankings, enter the URL of your TF2 Steam stats page into the "TF2 Stats URL" field of your User CP and click the Check button. Your stats page URL varies on a couple different factors, but is usually in the form: http://www.steamcommunity.com/id/yoursteamid/stats/tf2 or http://www.steamcommunity.com/profile/yoursteamidnumber/stats/tf2