how can i put pressure back in my isarHE24 combi boiler?

the pressure gauge went to half and a family member told me to bleed rads which i did,never having done this before,i think i over did it and got a pint of water out of one rad!i now have no pressure on gauge and no heating but i do have hot water.i have looked at user guide with no joy.the flexihose is not or has never been attached to the boiler and i cant find a picture or diagram to tell me where to attach it,im a technophob so can someone give me a idiot proof step by step guide on what to do,PLEASE!!