1. Check to see if your changes were saved by selecting 'Save' or 'Publish' from the ribbon in the page, list or library where you made changes.
2. If you do not have permissions to the library but changes are visible, click 'Check Out' to check out the page so that it can be published, checking in when finished.
3. Try refreshing/reloading the page, orre-opening the library or list, and ensuring that the latest version is being shown.
4. Check if you are using the 'Edit' checkbox to see the latest version including any changes.
5. If changes are still not appearing, sign out of the site, clear the browser's cache, and sign back in to the site.
6. Finally, check with the site administrator to ensure that you have the correct permissions.