I'm using Ubuntu 17.04 and Geany 1.29.
I've activated the plugin and I've tried using it in different ways without success.
For example, I select a "**<**" character and click on **Replace characters in selection** and nothing happens.
The same for other characters like "**&**".
Also tried the opposite, select an entity like "**&**" and didn't work also. So I have no idea what's going on or how to use it.