Is RefTagger still unavailable for Wordpress.com sites?
It was still unavailable the last time I checked.
There is a way to add reftagger to Wordpress.
https://reftagger.com/wordpress-tutorial/
Yasmin, please try "Method 2" on the page that James linked to, and let me know if you run into any difficulties.
My site is on Wordpress.com; the instructions linked to are for Wordpress.org sites. And this may be why I don't see the Editor option in Appearance.
I added the following to the standard Yearly theme by "Edit Site".
It works for me. http://TruthRightlyDivided.ca6558.AddReftagger2Wordpress.txt