have you seen this post? StaMPS - Detailed instructions - #2 by ABraun
Many things are explained there already very well.
You need a linux environment, install matlab and StaMPS, as well as triangle and snaphu. You will find the instructions in the StaMPS manual: https://homepages.see.leeds.ac.uk/~earahoo/stamps/StaMPS_Manual_v4.1b1.pdf
As you prepared the data in SNAP, you can then start the processing in chapter 4.
If you have specific questions, feel free to ask. But there are already several point-by-point information on what is required to run StaMPS and how to do it, so please try to start based on them first. It takes some reading though.