You should be able to select and type over any written text, or right-click
to see on the context menu a series of additional translation choices the
handwriting recognition made. In general, if the handwriting isn't 100%
clear, OneNote keeps and indexes a few alternate spellings when it performs
handwriting recognition.
No matter which of the two methods you choose above, the Page Tab should
pick up on the changed text and change the tab accordingly.