I remember the first time I went to change over the blade it seemed awkward as to which direction to turn the wrench.
If you have the Ridgid Model T1300, it should have a tool compartment on the left hand side, as you are facing the infeed side of the machine. There should be an open end wrench hanging in there.
The wrench fits very good on the square head screws holding in the blade, on my planer. To loosen them I turn the wrench from left to right.
I hope this is of some help.