[ic] Can't change ENCRYPTOR

[Michael Michaelsen]

I am trying to enter the line "/usr/local/bin/pgp -feat __ORDERS_TO__" as the ENCRYPTOR variable in Administration/knar in version 4.7.5. 
When I click OK to update it gives me this message: Sorry, the page (admin/preferences Variable) was not found 

Does anyone know what this means?

Is this the only place I have to make changes to enable PGP?
I have made the other configurations in the wizard and imported my PGP key.

Regards
Mike