To obtain B3TR tokens on testnet, whether you need to use them to distribute rewards with your app, you get B3TR tokens from allocation rounds.
You can start a new allocation round (in production those are started automatically each Monday and last a week, in testnet you need to manually trigger them, and they last 10 minutes), wait 10 minutes, then distribute the rewards to your app (done automatically in production, but you need to manually trigger on testnet).
You can access those functionalities from the "Admin" tab.
{% embed url="https://streamable.com/2seek2" %}
{% hint style="danger" %} Remember that to actually distribute rewards you will need to add your wallet as a reward distributor in your app's settings. Read more in the Rewards Distribution section. {% endhint %}