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    To edit the article view page:
1) The Source link is on line 13 of template/article.html. 
 <a href="<{$article.link}>" target="_blank"><{php}>echo planet_constant("MD_SOURCE")<{/php}>a>  
Copy the link code, paste it anywhere you want, and update the template.
You can replace the variable "MD_Source" to "More" on the new link:
 <a href="<{$article.link}>" target="_blank"><{php}>echo planet_constant("MD_SOURCE")<{/php}>a> 
becomes 
<a href="<{$article.link}>" target="_blank">Morea>  
Or, you can globally change the word "Source" to "More", by editing "_MD_SOURCE" on line 43 of language/yourlanguage/main.php.
 define($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.