To find or replace text in Page view or Source view:
Select Edit>Find or Edit>Replace on the menu bar
or
Right-click a page in the HTML editor and select Find or Replace from the pop-up menu.
Settings in the dialog box let you control the direction of the search and whether upper- and lowercase letters must match the search string.
Specify a search string in the Find text box.
In either view, you search for the text as you see it displayed. In Source view, you can search for HTML tags and property values.
If you need to change many element tags or property values, switch to Source view. It is the most efficient way to make many similar changes.