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Its easy as, mate. I searched YouTube for an instructional video, based on the model of my controller (C965). I can't tell which one you have.
https://youtu.be/rLIkl9KZDco

One thing I forgot to mention... the Bafang motor conversion has one advantage, in that you can go into the settings and unlock the top assisted speed and access many other custom options.

berg243 Not that I know of, although some of the muppets that have 1kW or greater motors will make sure that controls become a reality.
mudgripz - consider the conversion option. $2-3k will get a...