Creating new database: Unable to set Auto Value

[Jonahjones]

I'm new and have got stuck creating a new database. Following the instructions, I reached Step 3 in "How to create a new Database" and cannot perform action number 4 as the Auto value is greyed out.

[UnklDonald418]

A database table can have only one auto value field, so perhaps you have already defined another one.
Since there are numerous sets of instructions, a link to the instructions you are using would be helpful.

[Villeroy]

A new database with an embedded HSQLDB, one table, 2 columns created with OpenOffice.
Open the table for editing and mark the integer column as auto-value.

[Jonahjones]

The problem section of the instructions:
Step 3: Set primary key
1) Create a primary key should be checked.
2) Select the option Automatically add a primary key and check Auto Value.
3) Click Next.
What doesn't seem to work is the instruction to check auto value. This is exactly similar to the more illustrated version.
Since that time I've cobbled something together that partly works by ignoring those instructions, so I'm continuing with that. However, I'd like to do it properly as I still don't know what a primary key might be.

[UnklDonald418]

A Primary Key is usually an Integer, used by the database engine to uniquely identify a record/row in a database table.
A table without a Primary Key is Read Only, no new records can be added.
The auto value property allows the database engine to automatically generate a unique Primary Key value when a new record/row is entered into a table.
In a table with a Primary Key and no auto value, it is up to the user to enter a unique value for the Primary Key.