although I am the only user and manager of the system, it appears that I have no record of my password! This is not your fault and I have noted your reply. However, I cannot follow up your instructions because I cannot add a new user name.
Good. My OS X version is 10.9.4
Sorry to be dim - I am 82 but started to compute in 1952 on EDSAC1 at Cambridge. Have pressed cmd and r with no result. Must it be R and not r and where is 'boot'.?
I am using OS X to communicate with you. i am the only user and have never logged out!