fix error code

I am trying to use readgssi with python, to run a code that will transfer a file dzt to an excelspreadsheet. I Keep getting the same error which is runfile('C:/Users/a.becerra/.spyder-py3/Example/hello.py', wdir='C:/Users/a.becerra/.spyder-py3/Example')
Traceback (most recent call last):

File "C:\Users\a.becerra\.spyder-py3\Example\hello.py", line 1, in <module>
from readgssi import dzt

ModuleNotFoundError: No module named 'readgssi'

I will like to share screen so I can see how you fix the code so I learn as well