Help needed with FTM 2006

[Loopy Linda in La La Land]

I have my Gran's brother marrying one of my Grandad's sisters'..she dies..and then he marries another sister.

I can't seen to enter this on FTM when I try to add the marriages of William to Elizabeth and then Ruth it just adds Elizabeth and Ruth as two new people.

Anyone know how to do this?

Thanks

Linda