1. Log in to official website, Continuing Education, East China University of Petroleum, and enter the page where optional packages are located.
2. In the last column of the optional package list or the optional package details page, find the option to empty or delete the optional package.
3. Click the Clear or Delete button, and a prompt box will pop up to confirm whether to clear or delete the optional package.
4. Click OK to empty or delete optional packages.