You can't. Usually, after the final version of the master's thesis is uploaded, if the page number is wrong, it cannot be revised again. Because once the final version is submitted, the system will save it as the official version of your paper. If you want to modify it, you need to submit a new version, which is usually not allowed. Before uploading the master's thesis, you must carefully check whether the page number of each page is correct to avoid mistakes. Before uploading the master's thesis, it is necessary to keep a backup of the original document for reference and revise it if necessary.