A question about XSStrike tool.

Hello,
I want to scan a website against XSS with the XSStrike tool. I visited https://github.com/s0md3v/XSStrike/wiki/Usage and this tool need “GET” or “POST” methods. For example,

$ python xsstrike.py -u "http://example.com/search.php?q=query"

How can I find a properly URL of my target for it?

Thank you.