easy HR are notoriously bad at responding to applications - a joke considering they are crying out for suitable FO's.
If you have the required experience (500 multi crew hours MIN - doubt your F/E hours count) you will get a response eventually. Applications are all done online - they chuck away CVs that are sent to them.
If you don't have the required minimum I wouldn't bother wasting your time filling out the application as the system is designed to recognise that you don't meet their min requirements.
Gone are the days where a 'mate' could get you in. It's all HR now...