how to charge battery and connect battery to jayco eagle 10

thanks for help.
to Old-Biscuit:
except the black and white wire,there is no other larger cables near to the battery.

to Dakota98:
that means I need buy a anohter battery?
this battery is in there when I buy this pop 2 days ago and the seller didn't tell me how to use this battery.

I will use the battery for running lights,notebook,phone charger,kettle,rice cooker,fan(maybe).
I guess I maybe go out for 3-7days everytime.

can I use this battery?

thanks
Vincent