Forgotten Password Link

Firstly sorry I know there are many posts about this problem.

We have forgotten our password, when trying to use the forgotten password link it will send an email but then when following the link it comes up with an invalid key error.
I know there is a fix for this but unfortunately we are not computer literate enough to understand, we dont know what phplogin or ftp mean.
Does anybody know a way to reset our password when we cannot get into our blog to reset.
I am sorry to say it has to be a simple and easy way for someone as stupid as me to understand.