How can I provide some parameters to a function that is already defined in an m-file?

I donwloaded learnmcint.m-file (<http://www.mathworks.com/matlabcentral/fileexchange/12447-mcint/content//learnmcint.m>) and added there my own function. Now I would like to execute learnmcint with some parametrs that I would like to provide this function with --> for example learnmcint(y). These parameter y should be used in one of the function that I defined in learnmcint.m-file but I get always the error, that these parameters are missing. Does anybody know how to provide the parameters on the right way? How should I modify the file to be able to provide the parameters? Thank you in advance! Best regards!