If you want any sort of help then you will need to provide more information than that.

You can contact customer support directly at the following link

https://eurail.zendesk.com/hc/en-001/requests/new

Whatever you do I advise not to travel without a valid ticket, it is a very good way to get into bother with the rail operators and possibly the law.

Unfortunately, "It didn't work” is very hard to troubleshoot. You'll need to provide at least a description of the steps you took, a screenshot of any error message or a screenshot of where you are stuck.

If the activation itself doesn't work, check this article:

https://eurail.zendesk.com/hc/en-001/articles/7560433913245-What-should-my-device-settings-be-to-run-the-App-

Other articles may also help:

https://eurail.zendesk.com/hc/en-001/sections/4403367870877-Railplanner-App

If you're contacting customer service, check this article for the information they'd like to have:

https://eurail.zendesk.com/hc/en-001/articles/4571649483165-Information-required-when-contacting-us-