Yes, towards the rear or mirror end of your scope is the usual position for the DEC control.
However, because the scope is mounted inside tube rings and it has a dovetail mount, you can position it the other way as well. That may give you a more convenient position for eyepiece viewing.
Updated 12/25/13
However, because the scope is mounted inside tube rings and it has a dovetail mount, you can position it the other way as well. That may give you a more convenient position for eyepiece viewing.
Updated 12/25/13