How to find your sync code
Go to Settings->Sync (or navigate to brave://settings/braveSync/setup
).
If you see a screen that does not show the list of your devices in the sync chain, you have not yet set the device up to sync - either find one of your devices that is already in a sync chain, or start a new sync chain.
To find your sync code click the View Sync Code button.
Alternatively you can click the Add New Device button on the same screen, and then click Computer.