with no user pass, can't access terminal

I initially setup my user account with no pass, but when I try to use terminal it requires a pass. In the user accounts I tried to make a pass, but there doesnt seem to be that ability, I can change a pass but that doesnt work without an old pass. How do I overcome this little problem? The best thing would be to simply add a pass to my account, but how do I do this?

thx

not so, when I simply hit return, I get a password error in terminal, other areas that is true.