How to use user defined model

Hi all,

How to use user defined model. I have intel fortran 2020 compiler so do we need to link the compiler to the plaxis software and how we convert fortran file to dll. In videos I can only find to select UDSM and select dll file but could not find what should we do before this process. I am very new to using udsm so please help me in this matter.

Thank you.