How to remove/replace the ydevelopers certificate with custom certificate

We have been given certificate (jks file) to replace the ydevelopers certificate in order to remove the certificate error on navigating to backoffice/hac. How can we achieve this on tomcat server? Our infra does not include Apache server where we would have configured in httpd-conf file. Tried to configure the new certificate in the below property file but it seems to be not working:

additional.javax.net.ssl.trustStore=${platformhome}/resources/devcerts/myCustomCertificate.jks

Also tried to update the property file tomcat.ssl.keystore.path but this shows server startup exception.