you can use dotted-names commands to set the password or alias-name.
eg:
asadmin list "*security-map*"
domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map
domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal
server.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map
server.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal
asadmin get domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal.*
domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal.password =
domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal.user-name = jagadish
asadmin set domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal.password=jagadish
domain.resources.connector-connection-pool.jms/topicpool.security-map.topicpool-map.backend-principal.password = jagadish
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