How to prevent users to get to the admin panel?

Hi,

Everything needed is accessible in front-end (profile, post question, post answer, modify these…). By the way this website is not sending me to the admin panel after connexion nor to ask this question.

So I wonder why mine is doing it and if I have done anything wrong in the settings.

Many thanks in advancefor your help (eventually by mp?)

Sincerely,

Thierry