ALWAYS save the mnemonic seeds for all of your wallets just in case!
1
Restore after reinstalling the app
If you want to restore your wallet from the backup file, you need to reinstall the app first. After reinstalling the app, tap the Restore wallet button, then choose Restore from backup
2
Enter password and select file
Enter the backup password, tap Select backup file and choose a backup file from your device. After that tap the Import button