You need to download OPML file (your subscriptions list) from your current feed reader and upload it to BazQux Reader (click “Add subscription” ⇒ “Import OPML”).
Here are the OPML file download links for some readers:
Digg Reader https://digg.com/settings/export
The Old Reader https://theoldreader.com/reader/subscriptions/export
And of course you can upload your Google Reader Takeout.zip file.
To export feeds from BazQux Reader click https://bazqux.com/opml