You will need your recovery phrase for this.
If you have set it up to require the password to open the app, you will need to clear the data on the app to reset it. You can do this by reinstalling the app or by going to:
Your device settings -> Apps -> Find Enjin Wallet -> Storage -> Clear Data (These steps may vary slightly depending on your phone OS)
After resetting the app, simply open the app and import your wallet using the 12-word recovery phrase seed and set up a new password.
Here's a guide on how to import your wallet:
If you have forgotten both your password and recovery seed, it will not be possible to recover your wallet. This is why we insist that you must write down your recovery phrase on paper and keep it somewhere safe where you can find it again if needed.