Search for information in LegalServer from any page using the Search menu (the red text is optional for a site).
Whether you can see the Search menu, and what you can search on in the menu are controlled by your site administrators.
The Search menu does not currently support searching client or other addresses. Your site administrators may have added an Address Search report to your site.
The Search > People and Search > Clients options can include Email as a search field if your site administrators have enabled it.