The adaptor block above the one with alligator clips is the balancer connector. it's a multi-connector that will allow you to charger lipo's in 2cell, 3cell, 4cell etc...
Plug the balance adaptor into the charger and the battery into that.
Not all chargers charge lipo's via both the balancer and power connectors.
My madbull charger only charger only charges through the balancer connector. My other smart charger requires both the deans and balancer connectors attached to even begin.