You have reached to this
page after clicking on the How to Use ToolKit button on that menu
as you see in above picture.
Line Design button at the second row will take you to the ring hybrid design page. You can design your ring hybrid in microstrip form or stripline form in that page. You can obtain corresponding width over depth ratios for the transmission lines from impedance values or vice versa in that page. You can also obtain the S parameters of your ring hybrid design at the center frequency. Also there will be a button that will take you to the plot of S parameters in that page, as well.
About button will open a small window showing how and by whom this Hybrid Junction Simulator was developped.
If you have changed your mind about the type of hybrid junction you want to simulate you can use Main Menu button in this menu to go to back.