From the photo you just need to solder your chosen connector type on. You would connect both positives together and both negatives together on one connector. This is similar to the dual connector hard case packs. Double the connections for very high power applications.

To be honest id return the pack and get the one you actually wanted. It'll be easier in the long run. If you do solder this be extremely careful not to short it out. Lipos get very VERY ugly when that happens.