Here is a very clear concise tutorial on how to use Nanoloop.
It has not really existed any tutorial for the Android / iOS version until now and as it could be confusing to learn before the update, with the new version I can imagine that it became very confusing for the novice. The only tutorials that existed have been for the Gameboy version that do not look the same and have some different functions and I remember learning from them but with the prize of a lot of head scratching!
Even if you think that you know Nanoloop it can be good to read the manual if you didn't as there is some functions that are important but not too obvious.
Ahhh gotta love the Nanoloop!