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:
And of course you can upload your Google Reader Takeout.zip file.
To export feeds from BazQux Reader click settings icon ⇒ “Subscriptions” ⇒ “Export OPML” or click bazqux.com/opml.