Unable to Edit Equations

[LindsE]

HI there;

I'm attempting to edit some equations I have inserted in a large
document, and when I double click on them, or right click, there is no
response from the equation. I cannot even delete the equation and
reproduce it.

This document has to be edited. Is there any way for me to access
these equations again, either to delete or edit them?

Many thanks in advance.