InfoPath Dev

ive added the access database as a secondary data source in infopath 2003. After creating the textbox and clicking on properties --> data validation --> add, i can only select 'field 1' under 'select a field or group'. sorry if it sounds dumb. im new to this. thanks

Is it possible to check if a value entered in a textbox matches a value found in a microsoft access database table? what im trying to do is create a login application at the home screen