clone https://github.com/kaaproject/kaa repository (to let say kaa-master directory)
copy malotian.kaa.pubnub.appender to kaa-master/server/appenders/
update kaa-master/server/appenders/pom.xml, to include malotian.kaa.pubnub.appender as new module (<module>malotian.kaa.pubnub.appender</module>)
<modules>
<module>file-appender</module>
<module>mongo-appender</module>
<module>flume-appender</module>
<module>rest-appender</module>
<module>malotian.kaa.pubnub.appender</module>
</modules>