Hello! To add an adopted child, first create the child as you normally would with a couple's biological child. Then, click on the child, select "More actions" on the sidebar and click on "Set parents".
The adoptive parents will be displayed as primary parents, and you can "Set type of parents" below their names. Here you can select the option "Adopted". This will change the connecting lines visually (default is grey, but you can change this under "More Options" on the menu at the bottom of your screen).
If you want to go a step further and add the adopted kid's bio parents, you can go back to the "Main" sideboard of the kid, select "Add second parents" and create the bio parents. Under "Set type of parents" you could also switch primary and second parents if you wish.
Hope this helps!
