Lipo - Charging and balancing - HELP

I have some 2s2p 8000 mah lipo´s from Maxamps - I´m not sure of how many amps they should be charged with. The charger can do up to 5 amps. Does anyone know ????

I also have a balancer - Apache 505 from Maxamps - but i´m not sure how to connect it. If I just connect it to the plug on the battery if shows error. Do I have to charge trough the balancer ??

The charger is a Swallow 2 digital peak charger.

Please help