The steps to modify the personal picture of the educational administration system are as follows:

1. Go to Xuexin.com website and log in to your personal account.

2. On the "Personal Information" page, find the column of "Avatar" and click the "Modify" button.

3. In the pop-up dialog box, click the "Upload Photo" button and select the photos that meet the requirements to upload.

4. Confirm whether the uploaded photos meet the requirements. If it meets the requirements, click the "Save" button; Otherwise, please upload the photos again.