changing air filter on 1990 BMW 325i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
need instructions on installing a clean air filter...the manual I have doesn't depict what's actually under the hood. Where can I get better info?
(1) Answer has good repair info at a nominal cost. We use their pro service which is pretty expensive, but excellent service nonetheless.
Qualified Local BMW Shops
Qualified BMW Shops For This Repair