If you have no water, firstly check whether your neighbours are similarly affected. If they also have no water, contact United utilities on 0845 746 2200. If they have water but you don't, your pipes are probably frozen, so:-
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Locate your main stop tap (usually under the sink or closest to where water supply enters your property)
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Check your stop tap to see if it's working. If it is, turn if off to minimise problems when your pipes thaw.
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If there is a stopcock on the system side of the header tank, turn this off to stop water leaving the tank.
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Call Arena repairs line 0800 073 0613.