The basic information of Baijiahao is already under review. How to modify it?

There is no way to modify it. According to official website, the basic information of Baijiahao software is under review, and it needs to wait until the review is completed before it can be modified. If the modification request has been submitted and has not passed the audit, you can try to contact Baijiahao customer service to understand the audit progress, or leave a message in Baijiahao backstage to ask about the audit situation.