1. "Doonun" is a free font. Everything except selling is possible.
It is freely available for commercial use to all users, including individual and corporate users, and you are free to use it.
(It can be freely used in various media such as video media, print media, web, and mobile.)
2. However, users cannot modify/transform the font and redistribute/sell it.
3. If you have an image of a printed material or advertisement (including online) that uses "Doonun", I would be happy to show it off.