Gadget export
To export the edittop gadget, click on "Download" button, save the downloaded file, go to Special:Import on the destination wiki and upload it. Then add the following to MediaWiki:Gadgets-definition page:
* edittop[ResourceLoader|dependencies=user.options,mediawiki.util]|edittop.js|edittop.css
You must have appropriate permissions on the destination wiki (including the right to edit system messages) and import from file uploads must be enabled.