Syncing between different iPhones

What I did: I had a new iphone instead of my old one, and I want to sync my old notes on the agenda app there, but I cannot find a sync icon neither on the app nor on the website?

All you would have to do is log in with the same iCloud account on your new phone and install Agenda from the App Store, after that the notes should just sync over.

And is there a way to access/sync the notes from the website?

There’s no web app at this moment alas. See this post: