Install the font first before use.
How to install font
windows :
https://www.fontspring.com/support/installing/how-do-i-install-fonts-on-my-windows-pc
mac :
https://www.fontspring.com/support/installing/how-do-i-install-fonts-on-my-mac
How to use open type features
https://helpx.adobe.com/illustrator/using/special-characters.html


How to Add Swash in bellow text
Activate ligatures in Opentype feature
Type 'minus' and 'number' in the start of the text to add start swash.
Example : -1royalite
Type 'plus' and 'number' in the start of the text to add end swash.
Example : royalite+1

For add another swash for the end of the text,
you can type 'underscore' and 'number' in the middle of the text.
Exampe : Royalite_2

Thank You,
Sarid Ezra - www.saridezra.com