microsoft project training - Legends

Hi

I know you can turn the legend on or off and have alsorts of interesting combinations/permutations of the display but can you actually change what it shows? Some of the things are irrelevant and I'd like to be able to customise it.

Also I want to colour code the tasks to show which member of the team is supposed to undertake it and would like to show this on a key to keep the chart itself as uncluttered as possible and make it really easy to read at a glance.

I've had a hunt around in the help section but I can't seem to find very much information about the legends.

Thanks,

Phil