Newbie Question: Make a servo turn 90 degrees and stop.

nizer:
Interesting about the "servo"...

How about I control the postion as stated in one of the comments.

I have a pair of these fellas on an educational robot platform (diy). They work great. I’m sending ‘microsecond’ commands from an Arduino – rather than angular commands – as it offers higher resolution.
1000uS is full speed forward
1500uS is STOP
2000uS is full speed reverse
…anything in between gives a proportional speed. Very handy.
Cheers

First you will need to learn to be a technical reader. Where in the material you quoted is the word "position" found? For a quick answer, the servo you have cannot be set to a "position". It has been modified such that you can only control the rotation speed and direction.