Step 1) Open Don't Starve Together and press the Play button.
Step 2) Press the Account button as shown below.
Step 3) Browse to the Games tab on at the top, and then under Don't Starve Together press the servers button.
Please note, you may have to create an account if you do not currently have one.
Step 4) Scroll to the bottom of the page, enter your server name (This is just a name to display the token under) and press add new server.
Step 5) Your access token should now be generated and displaying on your screen.
Copy this token into your server_token.txt
