Just repeating for the local crowd, nostr.build now has help pages to answer most of your questions about its interface usage available at
in all 14 supported locales with matching screenshots and videos. I have also optimized the interface to remove any user perceptible lag, whcih should make your experience less frustrating 🫡

nostr.build
Help and guides
Step-by-step guides with pictures for nostr.build: edit photos, trim videos and GIFs, make memes and more.

