SSIS 2012 Package Parameters

Hi,

  I have an SSIS 2012 package that I have written and I have created parameters and inside the package I have created variables.  I wish to call the package and pass information into the parameters, not the variables.  Is there a way to do this?  All the posts that  have read seem to suggest passing information to the variables and not the parameters.

Thanks for your help,

Steven