A. If you are unable to save pins, first ensure that your app is updated to the latest version. If the issue persists, try clearing the app cache. Go to 'Settings' on your device, select 'Apps', find Pinterest, and tap on 'Storage'. Then, select 'Clear Cache'.

B. If clearing the cache doesn't work, try logging out of your account and then logging back in. This can refresh your session and resolve saving issues.