Send Certificates at a Later Time
Certify'em is designed to send certificates immediately and automatically upon submission of your exam. Even if you configure your Google Form settings to release scores "Later, after manual review", this will not change how Certify'em behaves when Automatic Certification is turned ON (due to a technical limitation).
If you wish to delay the sending of certificates in your exam, you can still achieve it through these steps:
Configure Certify'em settings by choosing passing score, certificate template, advanced options, etc.
Turn Automatic Certification ON. Once ON, immediately turn Automatic Certification back OFF. This step ensures that all settings are configured properly (for later sending of certificates). By keeping certification OFF, you ensure that certificates will not be sent out automatically.
In your Google Forms settings ("Responses" tab), set the Form to accept responses (turning Automatic Certification OFF automatically stops accepting responses).
Let people take your exam.
[Optional] Score any responses that could not be auto-scored (i.e. free response text questions).
At a later date choose "Issue Certificates Manually" from the Certify'em Add-on menu (see Issue Certificates Manually). Here you will see displayed recent responses to your Google Form/Quiz. You can use the drop-down menu to increase this up to the last 120 days of responses if needed.
Click "Process" next to any entries you wish to send certificates for. Or if you have a paid plan, you can click the "Process All" button (first select "No" from the "Already Processed?" filter to make this button appear).
Once a response has been processed (i.e. certificate sent for a response with a passing score), the "Already Processed?" entry for that response will change to "Yes".
Note that daily limits and quotas still apply when using this method.