Not sure what you mean exactly. But the eurail reservation service is known to not work well and usually is more expensive.

Have a look at this guide:

https://www.seat61.com/interrail-and-eurail-reservations.htm

Hi ​@Jenny Palmer, sorry to hear you are having problems getting to the external link on your phone. Reach out to our customer service team if the problem persists. However, you should be prompted to create or chose a trip once you are in the “Book Seat Reservations” section of the website from your desktop. If not, just go to the bottom of the reservation that you have searched and selected, then click log in to book, create a trip, name the trip, then add a traveler. There you can enter your Pass and make reservations. You can also add other travelers to the trip if you want to book your reservations together.

Hope this helps