Overview
this will show you where to find the editor and how to configure it.
where to get it safely
if you look online for it, you might come across other sights that promise you a free download but try to get you to do something first. those sites are not worth it.
instead go here[insaniquarium.fandom.com] and scroll down. it is under the mods, then visual mods. the link for the original website is safe, and you can get it without doing anything extra for the download. just download, install and configure.
configure
now for you to use the app, you need to configure it to your steam files.
go through your program files like you would normally to get to steam game files.
it would be in SteamsteamappscommonInsaniquarium Deluxe for all but userdata for your profile
user data would be accessed by opening run and looking up %PROGRAMDATA%SteamInsaniquariumuserdata
you just need to set the path to the folders and its all set.
edit to your hearts content.