Hey,
First, ensure that your underlying HDFS configuration is secure. Add the following to the hbase-site.xml file on every server machine in the cluster:
<property>
<name>hbase.security.authentication</name>
<value>kerberos</value>
</property>
<property>
<name>hbase.security.authorization</name>
<value>true</value>
</property>
<property>
<name>hbase.coprocessor.region.classes</name>
<value>org.apache.hadoop.hbase.security.token.TokenProvider</value>
</property>
A full shutdown and restart of HBase service is required when deploying these configuration changes.