Here's a great video on YouTube by Stu AG6AG detailing how to install the Winlink program.
He has a series of videos on the different modes of Winlink operation.
The VARA setup is mixed in with the Signal link video and is a little dated.
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https://www.youtube.com/watch?v=qSLghO6RgFU&list=PLvg1CrZfziQtz-Qg70flt1Ht2aK3XF03m