Go to fuelnow.network and scroll down to "CREATE YOUR FUELNOW ACCOUNT".
After filling in the appropriate fields, select "CREATE ACCOUNT" which will prompt an email verification to be sent.
After verifying, you will be prompted to sign in again. Since you're signing on for the first time as a carrier, you will click the link that says "REGISTER YOUR COMPANY". Then select "Providing transportation services for fuel products" and fill in the appropriate fields, including W9 and Insurance Certifications on the following page.
Finally, add a dispatch location and agree with FuelNOW's Standard Hauling Agreement. Now you're ready to roll!