Type the following command to install the certificate file:
keytool -import -trustcacerts -alias server -file your_domain_name.p7b -keystore your_site_name.jks
If the certificate is installed correctly, you will receive a message stating "Certificate reply was installed in keystore"
If it asks if you want to trust the certificate. Choose y or yes.
Your keystore file (your_site_name.jks) is now ready to use on your server. Just configure your server to use it.