Replacing Radiator on a Combi Boiler closed system

Please help. I have just replaced a radiator in my house and now the warning lights on my Combi boiler are indicating that there is not enough water flow in the system. Reading the manual it appears that I need to put more water into the system, but I have no idea how to do this.

 

Via the filling loop. You need to fill to the specified system pressure, then bleed the rads then re-fill etc untill all rads are bled finally ensuring that the system pressure is as it should be. When you've finished disconnect the fill loop.

 

Thanks for the reply. I have managed to work it out in the end. The filling loop was hidden behind a cupboard.

 

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