I have a exactly same charger from the same place...
It don't come with tamiya connectors of any kind. I think that is how the manufacturer made it. Not something lost/missing from package.
That charger need to have both the balanced connector and the dean connector pluged in to balance-charge a lipo. As R.I.T.Z said, some charger uses both connectors.
So either change your gun and battery to Deans or buy/make an adapter. (I wouldn't recommand the adapter... Since that will defeat all the purpose of deans.)
And always, always, balance charge your lipo.