Me too. It says, like.. Http and Https. Idk

unless you want a DDDOS (or whatever it's called) attack I suggest using the safe https

HTTP(S) is the protocal your browser uses to transfer data between you and Flipanim. HTTP doesn't use encryption, so if you just happen to browse in wireless lan using HTTP, someone from your neighborhood or nearby could illegally capture your wlan signal and read all of the data you're sending, which includes your passwords. However, that would be an actual hacker and would probably be more interested in robbery rather than your account. HTTPS, however, is encrypted. If captured, it would be completely useless to the hacker. (Credit to Parzival-comic for the info) Also the "Don't forget to save or export your work in progress animation from HTTP version, as from 22.01.2020 all connections will be redirected to HTTPS. All unsaved work on insecure HTTP version will be lost!" just means that if you're drawing something right now, save it using flipanim files or else once you move to HTTPS it will be lost.