This is an irregular verb. It follows the conjugation pattern of the verb llegar.
PresentPresente
No juzgo a nadie por su ropa.
I don't judge anyone by their clothes.
ImperfectPretérito imperfecto
Antes juzgaba a la gente muy rápido.
Before, I used to judge people very quickly.
Negative ImperativeImperativo negativo
Por favor, no juzgues un libro por su portada.
Please, don't judge a book by its cover.