trapped by what appears to be a lock on data entry

[Access beginner+]

I am trying to enter information into tables in a database created with Access 7. I am using Access 10. Some of the queries and tables have a key symbol to the left of the name in the relationships view. I cannot enter more information into these. How do I remove this "lock"?

[June7]

The key symbol means these are primary key fields. If the field is an autonumber type, you cannot manually enter data into it. The value is automatically generated when a record is initiated by data entry into any other field.