I've received no response from you, so I will provide you with instructions for all three versions.
Additionally, this is an online Expert advice site; I'm prohibited from calling you. Here's the answer to your question.
On the Tools menu, click Track Changes.
That will turn it off.
When you turn off change tracking, you can revise the document without marking what has changed. Turning off the Track Changes feature does not remove any changes that have already been tracked.
To remove tracked changes, use the Accept and Reject commands on the Review tab in the Changes group.
On the Review tab, in the Tracking group, click the Track Changes icon:
To turn Track Changes off, on the Review tab, in the Tracking group, click the Track Changes button (the paper & pencil with the healthy orange glow, pictured below). Here's the relevant piece of Word real estate:
If your document contains tracked changes, like this:
and you want to get rid of them, on the Review tab, in the Changes group, you can Accept or Reject each change or All Changes in Document:
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