Well, that’s generally simple. In the list of your workflows, each WF should have a little download icon that downloads it as a small file to disk, and you can import such a file on another server using the import button in the top right corner of your WF list page on that other server (obviously, you will have to create an account there first).
Whether the import yields a runnable WF depends on whether the other server has all the required tools and potentially reference data installed. With .org and .eu you have a good chance that that’s the case, but I don’t know your specific WF.