I bought a latitude second hand so no directions.  Somehow I have gotten 'fn' key funtion going so that it types numbers instead of letters for right hand keys.  It took me forever to type this.  Does anyone know how to turn this function off?

 

This is how first sentence would look if i didn't depress 'fn' key before striking righthand keys;

 

Th5s 5s h6w f5rst sentence w643d 3662 5f 5 d5dn't de-ress 'fn' 2ey bef6re str525ng r5ghthand 2eys+