In my opinion, you won't be able to make changes for the original article after it is published. However, if you find some minor errors of the article after publication, you could contact the editor of the corresponding journal. Perhaps, the corrections would be included in a corrigendum, if the errors were made by the author(s). Also, corrections would be included in an erratum, if they were made by the publisher at the production stage.
I had faced same problem there was mistake in published article so i contact publishing group and editor to make correction. No possibility to change mistake by author after publication.
If it is in-press, u can ask them to make changes and it is possible too in some Journals..But, once it is published according to the date/month of issue, then for sure can't be modified....Only choice is to prepare Erratum and request editor to mention it in the next issue.....