You may have to give more details of your situation with Screenshots and all, but let me see if I can help.
First, we'll go over this...
Did you select "Aimbot" as one of your hacks when creating your client?
If so, good job. Now how about this?
Do you have "Auto-AIM" activated in the ORape in-game menu?
Mine says "N/A" because I don't use Auto-AIM anymore, but yours should say something along the lines of "OFF" when it's not activated, and "ON" when it is activated. If it is "OFF," simply click "OFF" once and it will turn "ON."
ALSO:
In order to activate Auto-Aim, you must press the your auto-fire key (default "I") on your keyboard. Thanks to @theboo
IF THIS DOESN'T FIX YOUR ISSUE, POST SCREENSHOTS OF WHAT YOU THINK MIGHT BE THE PROBLEM AND HOPEFULLY I, OR SOMEONE ELSE, CAN ASSIST YOU.