[Plugin: Recent Posts Plus] Put a default thumbnail

Hi benetj,

It works the same as usual see http://codex.ww.wp.xz.cn/Post_Thumbnails#Setting_a_Post_Thumbnail.

Note: You need to make sure your theme supports post thumbnails see http://codex.ww.wp.xz.cn/Post_Thumbnails#Enabling_Support_for_Post_Thumbnails for information on how to enable support.