Export to Justinmind
Bring your artboards, pages and layers to Justinmind and turn your designs into an interactive, shareable prototype.
Download and extract the contents of this zip file. Then double-click the justinmind_1.0.5.sketchplugin bundle to install the plugin. This will only work if you are using Sketch 3.3 or later.
Everything is explained in this quick tutorial