Before migrating Neo N3 assets, be sure to upgrade your NeoLine mobile to the latest version: iOS v2.9.3；Andriod v2.15.5.
Open your NeoLine mobile wallet, click Discover at the bottom and find Migration Dapp in the Tools bar.
On the Migration page, select the asset and the amount you'd like to migrate.
After confirming the assets to be migrated and the quantity, click on Select Address under Addresses (as shown below) or click on the "Address Book" button and select the N3 wallet you want to migrate to from the list of N3 wallets that pops up.
Check the asset to be migrated, the amount, the target address, and little reminders carefully. Click Migrate after confirmation and click Confirm after double-checking the migration information.
Click Confirm and wait for the migration to complete, or go to NeoTube, the blockchain browser, to check the progress of the migration.
NeoTube official website: neo3.neotube.io