How do you add a second wife to family tree?
Welcome to the "Community.FamilySearch" Forum
I am just another 'lowly' User/Patron ...
Here are some "Knowledge Articles" in 'FamilySearch'
How do I add a spouse or partner in Family Tree?
How do I add step, adopted, and foster parents to a child in Family Tree?
How do I add step, adopted, and foster children to parents in Family Tree?
Go through those articles; as, they have step by step instructions.
IF, after going through those articles; and, you are still not quite sure what do do; THEN, come back here in this post of yours.
I hope this gives you something to work with and help.