Onslaught's soo much cooler then Sentinel.
To Put it in your sig,
First go to Your Control Panel
Then go onto Personal Info
Then Edit you profile
Then Scroll down to your Signature
And enter this:
[ IMG ]http://www.angelfire.com/gundam/saijin/Bubble1.gif[ /IMG ]
But leave out the spaces inbetween the [ and the IMG's