94 Beretta PS pump pulley

I'm trying to save my Mom some money and thought I would fix this for her.
The power steering pump pulley which is plastic has broke off at the
shaft bolt. Can anyone point me to a "how to" for the removal of the PS unit?
Looking in there it appears there will be a few other items that need to be removed? Also will need to replace the serpentine belt and for the life of me I cant see where any of the items that the belt drives adjust to release/adjust the belt's tension.
Thanks for your help.
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