All you have to do is put the module file inside of the site-packages folder that comes with Pythonista when you download it. (If you have deleted it, just make a new one with that exact folder name), and then when you make an "import" statement, just type in the name of the .py file for the module you just put in the site-packages folder without the .py.
Example:
# I make a module here, with a filename called 'mymodule.py'
def testfunction():
return True
If I want to have another file use this module, just do this, in a new file:
import mymodule # notice how there isn't a .py
print mymodule.testfunction()
When I run that file, it will print "True" in the output console. Does any of that help?