In the notification, click Show and choose a replacement font. When you open a spreadsheet that uses fonts not installed on your computer, a missing font notification appears briefly at the top of the spreadsheet. In the dialog, click a location in the sidebar on the left, or click the pop-up menu at the top of the dialog, then choose the location where the spreadsheet is saved. Open a spreadsheet stored somewhere other than your Mac (such as iCloud Drive): In Numbers, choose File > Open (from the file menu at the top of your screen).
Numbers shows up to the last ten spreadsheets you opened. Open a spreadsheet you recently worked on: In Numbers, choose File > Open Recent (from the File menu at the top of your screen).
For an Excel spreadsheet, drag it to the Numbers icon (double-clicking the file opens Excel if you have that app). Open a spreadsheet on a Mac: For a Numbers spreadsheet, double-click the spreadsheet name or thumbnail, or drag it to the Numbers icon in the Dock or in the Applications folder.
