A family of Microsoft relational database management systems designed for ease of use.
Firstly, you will need a referenced Statuses table with a single column, Status, which should be the table's primary key. Create a relationship between this table and you current referencing table to which your form is bound, ensuring that referential integrity and cascade updates are enforced in the relationship.
In the form change the text box to a combo box and set its RowSource property to:
SELECT Status FROM Statuses ORDER BY Status;