Hi Jing,
Thanks for reaching out to the Broadcom Forum on this!
I'm sorry for any confusion, but once you upgrade from SPE 8.2 to 9.2 the WebUI is no longer available, this was retired in favor of the RestAPI and the SPE console.
For more information see this link:
https://knowledge.broadcom.com/external/article/264611/after-installing-protection-engine-90-yo.html
I hope this helps.
Best,
Russ_V