Make sure you're typing the entire URL into Cydia's sources.
On a side note, I am working on this again. I will try to push out new builds by the end of the week (at the very least, replace the icon because plain white is awful). I am not sure why Cydia says the app is always needing an update, I will try to fix that (I probably wrote some file incorrectly).
Don't mean to spoil the fun or spoil Intyre's big release...but we already have a new editor, patcher, world viewer, entity editor (including sign and cosign) multiplayer, maybe a world generator (most devices can't even handle my version through Java 1.5) and some other secrets
Snowbound should do this as its been a while since you posted that comment and there has been no release of Impcedit 2, so i say go ahead with the editor