This document will explain how you can transfer TFT from Tfchain to Stellar and back.
Account on TFchain (use TF Dashboard to create one).
You can deposit to Tfchain using the bridge page on the TF Dashboard, click deposit:
You can bridge back to stellar using the bridge page on the dashboard, click withdraw:
A withdrawfee of 1 TFT will be taken, so make sure you send a larger amount as 1 TFT. The amount withdrawn from TFChain will be sent to your Stellar wallet.