If your reader is a Touch, Glo, Mini, or Aura HD, you can do the following to see the series name and number under the book title on the reader:
- Use the Series and Number metadata fields in Calibre to set the series name and number in the series for each book
- Go to Preferences / Change Calibre Behaviour, under Advanced select Plugins, expand Device interface plugins, scroll down and select the KoboTouch plugin, and click on Customize plugin
- Ensure that "Read metadata from files on device" and "Set series information" are checked and click OK
- Delete the books from your reader and re-send them from Calibre
Now, when you view book titles on your reader in the library or shelves, between book title and author name you will see
<series name> - <number>. This works for me with Aura HD. I don't have a Touch, Glo, or Mini to test with, but they use the same device interface plugin so I would assume you can set the series information on them in the same way.