If you dont know the shariah here it is:
a man is allowed to marry whom he wills among women as long as he does not bond in marriage under his care and responsibility more than four women. And this is conditioned upon him dealing justly among them the known justice specified by
shari’a which includes overnight stays and spending. If he does not have the ability and capacity to deal with such justice, then he should suffice with one, as Allah indicates in Surat al-Nisaa’ in ayah 3, which has a meaning that can be translated as:
“… marry women of your choice, two, or three, or four; but if you fear that you will not be able to deal justly (with them) then only one…” (4:3)
Furthermore, no evidence appears neither in the Qur’an nor
sunnah requiring the permission of the first wife if her husband wishes to marry another wife, and therefore he is not required to ask her permission. However, he needs to be judicious in taking this decision and to weigh it carefully with respect to benefits and drawbacks and to look with the eye of wisdom at all of the considerations pertaining to the matter, and he should strive all he can to conciliate, reassure, and satisfy his first wife, in order to ease and mitigate the effect of the matter upon her.
https://islamqa.info/en/61