Hey there! Not sure what form you’re using but the normal conjugations for leer are as so.
Yo: Leo
Tú: Lees
El/ella usted: lee
nosotros: leemos
vosotros: leéis
ellos/ellas/uds.: leen
In this situation you are using the ellos ellas section so I’d say leen. But again not sure what form you’re using if you’re attempting preterite or such so I’d suggest googling leer conjugations and using SpanishDict. It’s a very reliable source for conjugations.