Create a recordset that returns the Userlevel Name and UserLevel ID column from the user level.
Make note of the name of the user level text box in your form, then delete it and replace it with a select list. make sure to set the name of the select list to the same name as the now deleted text box.
in the property inspector, click the Dynamic button set the contents to use the user level recordset that was created. Set the value to use the user level ID and the label to the userlevel name .