Help - User Validation

By Pete01

My site seems to be runnig smoothly but a couple of new users haven't recieved their validation emails, I've resent to no avail. Does anyone know how to manually validate on 1.6.1?  I've tried a couple of methods found on here but they don't seem to work at all - I'm quite happy editing my DB directly in this instance, if needed.  I did install Site Access but it didn't show existing unverified users so I couldn't use it and as I can't delete them either.

I'd really appreciate it if anyone knows what I can do.