How to change key/password in the Agent

Hi, all,
I am new of net-snmp, I am trying to change the authentication key and
private key in a agent and using snmpusm.  But failed.
		
1.	If I use 
	/usr/local/bin/snmpusm -v3 -l authPriv -u test-agent -l authPriv
-a MD5 -A test_authkey -x DES -X test_privkey 192.168.83.4 -Ca passwd
test_authkey authkeytest,
	
	I got Unknown command error.
	
2.	If I use 
	/usr/local/bin/snmpusm -v3 -l authPriv -u test-agent -l authPriv
-a MD5 -A test_authkey -x DES -X test_privkey -Ca 192.168.83.4 passwd
test_authkey authkeytest,
	
	The command successfully, but the key of the agent did not
change.

What is the correct command? 
Thanks

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