How should I use ZBl potential function

Dear All,

I want to use the ZBL potential function to simulate the process of radiation damage, but I don't know how to use it.
I tried to add it to the .gin file in the form of keywords, but the software didn't seem to recognize it.  The keyword was not found in the calculated .gin file.
How should I use ZBl potential function?
Thanks in advance.
Kind regards.
Jiali,Jiang