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To edit the article view page:
1) The Source link is on line 13 of template/article.html.
le="color: #000000"><?php <a href="<{$article.link}>" target="_blank"><{php}>echo planet_constant("MD_SOURCE")<{/php}></a>
Copy the link code, paste it anywhere you want, and update the template.
You can replace the variable "MD_Source" to "More" on the new link:
le="color: #000000"><?php <a href="<{$article.link}>" target="_blank"><{php}>echo planet_constant("MD_SOURCE")<{/php}></a> becomes <a href="<{$article.link}>" target="_blank">More</a>
Or, you can globally change the word "Source" to "More", by editing "_MD_SOURCE" on line 43 of language/yourlanguage/main.php.
le="color: #000000"><?php define($GLOBALS["VAR_PREFIXU"]."_MD_SOURCE","Source"); becomes define($GLOBALS["VAR_PREFIXU"]."_MD_SOURCE","More");
2) To remove sibling articles, visit control panel preferences/planet and set sibling articles to off.