How to buy ETN in USA?

Excuse me, could you please explain the process of purchasing ETN in the United States? I'm interested in investing in this cryptocurrency but I'm not quite sure where to start. Could you walk me through the steps, including choosing a reputable exchange, creating an account, funding my wallet, and placing an order for ETN? Additionally, are there any specific regulations or restrictions I should be aware of when buying ETN in the US? Thank you for your help.