i have tried to download but i can figure it out can someone help me go through step by step instruction for my guild website

Read the wiki page on installing: http://www.wowroster.net/wiki/index.php/Roster:Install

If you run into problems, post your problems here and provide us with as much information as possible.

Could not include /chroot/home/forgott1/forgottenones.darkstargamers.com/html/roster/install/template.php - check to make sure that the file exists!

and the file does exists

Ask your host if they either have open_basedir enabled or php safe mode and if either of them are enabled have them disable them.