Please note that you require to go through 3 core processes to apply SSL Cert to your website.
1. For activating your purchased order: Click the link provided in the activation email. Contact us if you have any question about this.
2. After order activation please generate CSR file to prepare for installation.
Here is a reference link for CSR (Certificate Signing Request): https://www.thesslstore.com/ssltools/csr-generator.php | Free CSR Generator - Generate a Certificate Signing Request (ssltrust.com.au)
3. Please visit the following websites for respective brands' SSL certificate installation guides for different server environments:
Sectigo (formerly known as Comodo):