Hi,
That is that I want to be able to turn on and off the LDR
Do you mean you want to disable the effect of the LDR?
How do you want to do that?
1)
Using another input?
So leaving the relay SET or RESET what ever its state when disabled.
Or
2)
Disable the LDR inut when the Relay is activated, thus SETTING it ON.
How will you Reactivate the LDR and hence RESET the relay?
Tom... 
Also a link to the Blynk App.