Simply click Sign in to LeetCode in the LeetCode Explorer will let you sign in with your LeetCode account. By clicking the button btn_endpoint at the explorer's navigation bar, you can switch between different endpoints. The accounts of different endpoints are not shared. Please make sure you are using the right endpoint. The extension will use leetcode.com by default. Directly click on the problem or right-click the problem in the LeetCode Explorer and select Preview Problem to see the problem...