This plugin has not been updated by its developer since a long time ago.
It could imply partial or total lack of compatibility with the latest versions of b2evolution.
This plugin lets you "pre-write" bits of text with (allowable) HTML for easy insertion when posting. It is NOT a renderer! You see what you insert, so you can make minor edits as need be. You get up to 5 "cans" for text/markup, and can customize the button labels for each can. For example a download link using an image is easy to pre-write (that's what I do). Or if you want to remind your readers about an upcoming event or fund-raiser. Anyway there ya go!