Export your subscriptions from Google ReaderClick the 'Settings' gear icon in Google Reader, and choose 'Reader Settings'
Select the Import/Export tab, and click the Download your data through takeout link
Click the Create Archive button
And download the archive.
Open up the downloaded zip file, navigate into the Reader folder, and extract the subscriptions.xml file. This is in a standard OPML format that can be imported into Blogtrottr.
Import your subscriptions into Blogtrottr
Log into your Blogtrottr account (if you've not got one yet, you can sign up here)
From the My Subscriptions page, click OPML import
Choose the subscriptions.xml file from earlier, and click Import, and you're done!