official documents on import and export.

basically, the process is done via Special:Import and Special:Export. from toolbox click Special pages, locate Import pages and Export pages links.

export

goto Special:Export. enter page names, one page per line. if page include namespace, prefix page name with the namespace.

not sure of names, look up via Special:Allpages. copy and paste name to export page.

exported file will be saved in xml format.

import

goto Special:Import. browse for exported file saved above and upload.