If you want help rooting you should be posting either in the HTC One Mini forum here on Android central, or, even better, the HTC One Mini forum on XDA. Not many people have an HTC One Mini, so posting in a general section like this, you aren't likely to get many people who have a rooted One Mini to see your thread. Or search on Google. If you search "root htc one mini tutorial" the very first result is a simple, easy to understand, step by step tutorial of how to root the HTC One Mini. First you need to follow the tutorial to unlock the bootloader, then the tutorial on how to flash a custom recovery (either Clockwork or TWRP), then the tutorial on how to root.