Setting specific access priviledges for web use

Hi. I have a database (FMP 9) of individuals with their unique
records. I want each individual to be able to go to the web and change
their record without having access to the records of other people.
However, by giving access to the database in Accounts and Priviledges
I cannot limit what records they can access or not. So I as an
individual can access the information of other individuals. I want
each person to only have access to their record.

How can I do this?

Thanks for the advice.

Camilo