I cannot add servers and see those I added before in the list

I cannot add servers and please see in the picture.

There's not a button for me to add servers

I'm using port mapping to map my LAN multiplayer gaming to WAN in order to create a server that Beta users can join in and play,but without adding servers, I can do nothing XD. Please fix

Steps to Reproduce:

1.Start the game

2.Click"play"

3.Swich to "servers"(which is the third selection )

4.You will see there is no buttons for you to add servers.