hello. here is the link to getting your phone rooted. it seems complex, and it is, but if you slowly and carefully follow instructions, then you shouldnt have any issues. i prefer the clockwork recovery, but you can choose either one. tips for success: read it twice. download all the files and install as described. read it again. then proceed step by step.
link:
http://androidforums.com/one-s-all-things-root/543328-how-unlock-bootloader-install-recovery-root-your-htc-one-s.html
link:
http://androidforums.com/one-s-all-things-root/543328-how-unlock-bootloader-install-recovery-root-your-htc-one-s.html