This is a Glitch on flipnote.Its a little confusing but trust me once you get the hang of it,its pretty easy

Step 1.Download any unlocked flipnote

Step 2. Copy and part of it you like

Step 3. Create a new flipnote

Step 4. Go to the copy/paste and hit Copy.

Step 5. If you did it right the paste button should be usable now hit it and what ever you copied should be there.

Now please do not tell anyone about this glitch or Hatena will fix it.
Thank You Torn[MK]