Linking beolab 2 to beolab 3 to apple airport express to samsung tv

I have linked the beolab 2 from my non b&o tv then from beolab 2 to me beolab 3's but also wanting to be able to play my iPhone songs through to the speakers also and had an apple airport express linked to the beolab 3's on there own when I first got them but was wanting a sub and got rid of my 5.1 to get the b&o 2.1 set up instead, if anyone can help me how to do this as currently have the apple express linked to my tv from a 3.5mm jack plug to an RCA (red/white) to the tv and can't get any sound out anywhere from my phone, the tv in question is a samsung ue40es8000 and have tried this port with my headphones what I use for gaming and work fine