In our Kingdom, anyone willing can get betrothed! This is easy to do:
• Find the desired player in your friend bar and left-click their icon.
• Select Betroth and attach a beautiful ring of your choice.
• Send the proposal with the ring to your future mate.
• That's it! Now you only need to wait for their answer.

You can use the Bulletin Board to look for single players who are not your neighbors.