In an article select the three dots on the top right corner of your screen. Then select the envelop.
We have temporarily removed the direct gmail forwarding, and we're currently working on making it better integrated. In the meantime, the work around is to use google+ email capabilities to share articles. On feedly for desktop, in thew article view click the g+1 icon (below the article name). Add email addresses in the bottom box and click send. This workaround using g+1 also works on feedly mobile.