in zoho creator I would like to disable or enable a certain field based on the user profile in customer portal.

I know which user it is (zoho.loginuserid) but I don't know how to have access to information about the profile associated to the user.

Is there a way to do this via deluge script?

Because I tried first this, I went to settings,  users and permissions, field permissions, chose my profile and my form, edit, and put "Read only" on true for my field. But this change had absolutely no effect. Is this a bug from zoho?