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Change the spfile to include the second instance init parameters.
once you set the required parameter for new instance then you just need to add the new instance to cluster using the srvctl
srvctl add instance -d db_unique_name -i inst_name -n node_name
once you added the instance , start it using srvctl.
in order to start or stop manulally using sqlplus you need to create a pfile specifying the location of spfile.