@Setanta,
The 'we' refers to the general 'we' and in this it is the same as the general 'you'.
If you, specific, not general, are unable to understand something as elementary as this, you, specific, should probably refrain from offering advice on language.
If you, general, are unable to understand something as elementary as this, you, general, should probably refrain from offering advice on language.
If we, general, are unable to understand something as elementary as this, we, general, should probably refrain from offering advice on language.