Clicking the provided link allows users to sign up and receive $200 of credit to try DigitalOcean's products over a 60-day period. Hacktoberfest is a month-long celebration of open source software, where contributors can participate by submitting pull requests, bug fixes, or documentation updates to various projects. To participate, users must first sign up on the Hacktoberfest site and then submit four pull requests between October 1st and October 31st to receive a free limited edition T-shirt. The event aims to make it easier for contributors to locate projects that need help and for project maintainers to highlight issues ready for work. Users can connect with other participants by using the #Hacktoberfest hashtag on social media platforms, and DigitalOcean has also provided resources for both project maintainers and contributors on the Hacktoberfest site.