If you are a developer, and you can deploy tokens using the Rainbow Bridge:

Following is the process:

Access the Rainbow Bridge deployment feature.
The UI will walk you through the deployment steps.
Once deployed, raise a pull request on this repository to have the Aurora team add your metadata.
Once the Aurora team process and approve your PR, your token will be searchable by symbol on the bridge transfer form and other dApps will be able to display balances correctly.

For questions, you can reach the bridge team at support@rainbowbridge.app.