Francesco, let me know if I can be of any assistance in getting it working. Redirects are notoriously tricky. I just tested the plugin with WordPress v3.6 for compatibility, and it worked like a charm. The challenge may depend on how your permalinks are set up.
If you want to redirect a URL like https://www.example.com/blog/2013/01/01/my-blog-post/ to https://www.example.com/blog/2013/01/01/my-blog-post2/ you’d need to enter the following in the Redirect Editor:
/blog/2013/01/01/my-blog-post/ to https://www.example.com/blog/2013/01/01/my-blog-post2/