delphi ado insert data in fields cause primary key error

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Delphi

Hello,
I have an access database and connected to a Delphi application which use adoconnection, ado dataset and datasource to connect to the database, I use a db navigator to insert update delete etc., the problem is (access database has a primary key) that I have to insert primary key value manually when inserting a new record or else I get an error about a "double value in a unique field" and explains something about the primary key (error is in Greek so I trnslate it as exact as I can). Any ideas on how to insert the primary key automaticaly when I add a new record?

Thank you
Kyriakos