Do any of the following:
If you opened the file recently: In Pages, choose File > Open Recent (from the File menu at the top of your screen), then choose the document. Pages shows the last ten documents you opened.
If you know the document title: In Pages, choose File > Open, then enter all or part of the title in the search field. To narrow the search, click the pop-up menu at the top of the Open dialog and choose where you want to search, or click your home folder or document folder in the sidebar on the left. When you locate the document, double-click the document to open it.
Tip: To see where the file is saved on your Mac, select the document in the search results; the file path to its location is displayed at the bottom of the search results.
If you don’t know the title, or you want to search email attachments and document content: Click the Spotlight icon in the menu bar in the top-right corner of your screen (it looks like a magnifying glass), then enter one or more words from the title or from the document content. In the search results, click the document to see a preview of it. To open the document, double-click it. To see where the document is located on your computer, hold down the Command key and double-click the document.