User permissions customer portal

User permissions customer portal

Hello,

I'm using the customer portal and created a new profile.
This user should be able to use a form, but for one field he should not have the permission.

How can I make sure the user with the profile I created isn't able to input that certain field?

for example:

When a public user is using the application I can user the following if rule:

if (zoho.loginuser == "Public")

How can I script this for a certain profile I created?

Greatings,

Erwin