/diy/ - Do It Yourself

So we bought a heating bed for our printer but I swear to god the instructions for this model of printer are extremely shitty. We got a BQ Hephestos, a modified Prusa i3, and we're trying to set it up but we're having lotsa issues.

First of all, the heating bed is conected completly to the printer or some cables go to the power supply and some to the printer chipset?
We also bought a new power supply of 360W. Is the power supply only for the ehating bed or we have to replace the default power supply for the new one?
And msot importantly, where the fuck do we plug the heated bed in the chipset? the instructions say little to nothing and while the printer seems to detect the bed, whenever we change temeprature the bed itself doesn't get warm.