No sign-up code is needed. Just visit the respective links, sign up, and you’ll be eligible for the bonus.  The confusion often comes from the fact that Swagbucks has something called Swag Codes, which are small snippets of text hidden throughout the site, the Swagbucks app, and the company’s social media pages. When you find a Swag Code, you can enter it into a form in Swagbucks to earn free SBs (the typical amount is 1-4 SBs.) /SwagCodeSpoilers is an active Reddit group where users post new Swag Codes whenever they find them.