Where can I change the content of the 'About' page

I've looked everywhere and can't find how to change this page (or the terms and conditions or privacy policy). Can anyone point me in the right direction? 

You could use my PageEditor module ;)

Yes, there are plenty of page editors in the market for editing the pages that use the language keys for the page text.  There is even a free module.

I don't mind anyone mentioning they have a module for sale to do something but you should also at the same time tell the person how to do it for free, since this is a part of Dolphin that is easy to change.  The main use of these forums are for helping members, not selling a module.

Now, to change the About Us page you edit a language key.  I will return in a moment with the correct key to edit and how to edit it.

The About Us page uses the language key _ABOUT_US

You will go to settings, language settings, and enter that key in the filter box and press the checkbox.  You can use HTML markup.  To make it easy to change the key, I suggest using an editor, say the one for writing a blog post.  Once you have the text as you like, with highlighting, bold, etc.  Go to the HTML view, copy everything, and then you can paste that into the language key box and submit.

Now, I do agree that the modules makes editing these keys much easier and I do use one of them on my site.

The other pages use other language keys.  Tell me the ones you want to change and I will see if I can determine which key is which.  Or if you prefer, you can go to the market and look at the page editors available for editing these keys.

The Contact Us is a php script, contact.php, you have to edit that script to make changes in the Contact Us form.

Thanks geek_girl. Amazing support for the community as usual. You should start charging :-)