I apologize, as I don't have a clue about what might be obvious to you.
I always offer the 'disk' suggestion when I see that someone appears to be struggling with some (obvious to me

) straight-forward directions, which will be safer by using the disk. enough said...
The first two methods are much simpler, and which one you choose depends on which version of OS X that you have. One will work, the other won't work on your system. So, use the one that works. Those two methods don't affect the user account, except for resetting the password.
The alternate is more involved, but you should get good results if you simply follow the steps. That alternate method does NOT reset your password, but allows you to create a new user account on your Mac. There's some extra information about results, that you might not encounter on your system, such as after step 2, where it mentions removing orphaned unlinked files. That doesn't always happen, so you shouldn't be concerned if you don't see that same result. Just simply go from step to step.
What about that process doesn't work for you?