1987 325 new owner

I am a new bmw convert from VW. A college student with my very own 325i. True, its a 1987, but I like it.

I have a few questions? How do I work the trip computer, (it seems to be in kilometers, can I convert it to miles?)

Is there any place to find an owners manuel online?

under the avg mpg button on the on board computer is a small button--press it in once to change units of measure to US