How to use user routines, especially wvlnsh.f

Advanced Features and User Routines
1

Dear ceruttif,
Thank you for your help.
For the second point,I have understand it.
The first point,I do not know how to use a user routine,not to say write it,could you give me some guides and examples to learn it?(especially about wvlnsh.f)

2

Dear @xiongbp,

You might have a look at these 3 threads:

  1. How to add user routines to a Flair project
  2. How to link an external routine
  3. Wvlnsh.f user routine
3

Dear@amario ,
Thank you for your reply,I will try to use it.