To search for and replace words and phrases in the PDF Editor, follow the steps:

1. Click the  tab in the pane on the left or click View > Search to open the Search pane.
2. Go to the Replace tab.
3. In the Find what text field, type the word or phrase you want to find.
   Words or phrases that match your query will be highlighted in the document.
4. If required, click the arrow next to the   icon and select Exact Match or Match Case.
5. In the Replace with field, enter the text that will replace the original text.
6. In the search results, mark a word or phrase to be replaced.
7. Click Replace. This will replace your selected word or phrase with the one you specified, and the corresponding entry will be removed from the search results.
8. Save your changes.