Click on the Towers Button ( ). You must see the below image

In this part you can see the feed, this is the load could be refinated in our tower.

Set the pressure of the tower, this pressure is in the top.

Set the temperature and flow of the load

Reflux is in the drum.

Click the compound, and enter the composition of the load.

In Top, mark if you want to the program keep that product in this quality.

In Below, mark if you want to the program keep that product in this quality.

The other values is the material which one want to build the unit.