Users - deleting and editing

Users - deleting and editing

Hello

I have 1 questions about users:

1/ How do I delete users from a project? Do I need to have Portal Admin rights?
I have tried the instructions in the User Guide but they do not work at all.

2/ How can I amend user details ie the spelling of a person's name? 
It appears that I can only amend my own details which would be crazy as it means I would have to sit with each person in the office to change the way they have spelt their names.

Thanks