When you first install JMP, you can install the Excel add-in as follows:

However, some people did not select the above function during initial installation, or experienced the disappearance of the JMP add-in menu in Excel while using JMP.
In this case, please proceed as follows.
1. (If open) Close JMP.
2. Using the control panel , select “Change” program .

3. Select “Modify” program below

4. Reinstall the “ Excel Add-in” below.

The above is also explained in detail in the following link:
JMP Note 575299 - How to install or re-install the Excel Add-in for JMP® when the JMP tab does not appear in Microsoft Excel
If the above method does not work, then try reinstalling Excel (or Office).
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