Change the error message given?

[Tiger1]

I have placed an expression on a table:

SWITCH(USEREMAIL(),
“gentry.perry@modernusa.com”, “ALL_CHANGES”,
“READ_ONLY”)

This restricts ONLY Gentry to be able to use the form (i created a form). I understand this part - but how can i change the message that pops up - if the user is NOT Gentry? See below:

[Steve]

You cannot change the message. Instead, consider preventing the unprivileged user from getting to that page entirely.

[Tiger1]

Great idea…