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If you have done a successful channel scan for each and every tuner, there is no need to 'map' any channels - it's already happened automatically as part of the scan, so all of the channels found in the scan should already be in the right-hand 'Channels mapped to card' column - see the image here: Mapping

The mapping section is to allow you to add or remove channels from a tuner that you know should work or don't work e.g. if you have several identical tuners connected to the same antenna, you can just scan one of them then use mapping to copy the channels from one tuner to all the others (thus saving a bit of time compared to scanning all of them one-by-one).