Update button on header of page

I updated a page on our website. I named it the same as the old page and renamed the old page. There is a button located in the header of our website that links to the old named page. For the life of me, I cannot edit this button using the instructions found on the Squarespace help, nor can I find where to update the new link for the button. Does anyone have a workaround for this? To see what I am referring to, go to www.doorstofreedom.com. Get Involved>Donate is the new page. The button is the black donate button on our header, which loops to the old inactive page. Please help!!

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I cannot edit this button using the instructions found on the Squarespace help

Are you following instructions for Squarespace version 7.0?. That is the version of SS you are using. If you try to follow instructions for v7.1, it won't work.

Your Donate "button" is actually a link that is part of your Secondary Navigation in Pages styled to look like a button. Here is an example of the Pages panel.

Let us know how it goes.