First of all, make sure your friend clicks the link you sent and signs up for a Soundation account from that page. Secondly, if your friend signs up for a free trial, you won’t get a reward (just yet!). Once your friend buys a subscription, you’ll get a reward immediately.

You can track your friends’ activities on this page: https://soundation.com/account/referrals

There, you'll be able to see if your friend signs up for an account or subscribes to a Yearly Premium plan.