Use the Find & Replace option to search for text within your visual and replace it with something else.
Click on Find & Replace in the Page tab and type what you want to find in the Find field. If you simply, want to find instances of a text string, just click on Find without putting anything in the Replace field.
To replace the text, type the desired replacement in the Replace field and click Replace or Replace All, respectively.
To define how the search is done, choose either Match whole word only or Match Case from the Options button represented by the gear icon.