I noticed the brake master leaking now

Here are the master cylinder installation instruction you have requested. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car.

https://youtu.be/WDxvEQrMkBg

and

https://youtu.be/w7gUsj2us0U

and

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Plus here is a guide that will help with bleeding the brakes:

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Below you find the process from the manual on how to replace the master and bleed the brakes. Please let us know if you need more info. Thanks