[Plugin: Recent Posts Plus] Put a default thumbnail

Hi benetj,

It works the same as usual see https://codex.www.ads-software.com/Post_Thumbnails#Setting_a_Post_Thumbnail.

Note: You need to make sure your theme supports post thumbnails see https://codex.www.ads-software.com/Post_Thumbnails#Enabling_Support_for_Post_Thumbnails for information on how to enable support.