that is done in the description.ext file, and with a couple triggers. There are tutes avail here at ofpec, but here is the syntax I use in my .ext :
respawn=3
respawndelay=6
TitleParam1 = "Time";
valuesParam1[] = {10000, 300, 600, 900, 1200, 1500, 1800, 2100, 3600, 7200};
defValueParam1 = 1200;
textsParam1[] = {"Unlimited", "5 Mins", "10 Mins", "15 Mins", "20 Mins", "25 Mins", "30 Mins", "45 Mins", "1 Hour", "2 Hours"};
titleParam2 = "Score to win";
valuesParam2[] = {10000, 5, 10, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200};
defValueParam2 = 20;
textsParam2[] = {"Unlimited", 5, 10, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200};
There are MANY things that can be put in the description.ext file. I would like to suggest you get an editor, I use both xSQS and Chris's ofp editor.
Get both here:
http://www.ofpec.com/editors/browse.php?browsewhat=3&category=3_1Hope this helps!