Boot your Windows usb. Select language and keyboard. Hit Shift+F10 and you will get a command line. Type notepad, shrink the notepad window and hit Ctrl+O. Identify the drive letter of your windows installation. Close the file manager and notepad.
Then
It is not that it isn't permitted, it is just highly discouraged. Pictures are only acceptable when there is absolutely no other means of uploading an error message. Posting a picture of an empty screen with only a cursor is completely pointless and a total waste of bandwidth.