You must have FBI (the open-source CIA package installer) installed on your 3DS HOME Menu. This tool is standard in almost all modern 3DS homebrew setups.
Select the Flipnote Studio CIA and choose . flipnote studio dsi cia
Exit FBI and return to the Home Menu. You should see the Flipnote Studio 3D icon. Tap it to launch, and you are ready to start animating! You must have FBI (the open-source CIA package
Nintendo eventually released Flipnote Studio 3D for the Nintendo 3DS. However, many purists and veteran animators still prefer the original DSi version for several distinct reasons: flipnote studio dsi cia
The official service ended in 2013. However, the community-run Sudomemo server allows you to share animations again.