Hey @MaRoe!
At this time our stores aren't accepting modem returns however you can definitely ship it back and you don't need to print anything out 
Since you got your exchange by mail though, a return waybill should be included in the package.
If it's not there, all you need to do is contact us and we'll send you a package to return it in
If you prefer, we can also PM you here on the Community, just let us know!
