A steroid hormone influences the cellular activities by

Hormones which interact with intracellular receptors (e.g., steroid hormones, iodothyronines, etc.) mostly regulate gene expression or chromosome function by the interaction of hormone-receptor complex with the genome. Cumulative biochemical actions result in physiological and developmental effects.

Water soluble hormones interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers (e.g., cyclic AMP, ${\mathrm{IP}}_3$, ${\mathrm{Ca}}^{++}$ etc) which in turn regulate cellular metabolism.

Hormones do to catalyze reactions unlike enzymes.