When attempting to follow the video on Making playlists of your own music to play in the Syrinscape Fantasy Player There is no Plus symbol in the left hand side next to the word soundsets to be able to create an new sound set. 
Please advise…
Anybody can use Syrinscape Online but to be able to host a game or use the Creator functions you will need to have an active Supersyrin subscription.
That will then allow you to create your own soundsets, copy and edit existing ones and even upload your own music and samples 