if you are using italki via mobile follow these steps in order to find a language partner section -> if you want to find a language partner just go to your My Contact and then press on ( + ) . you will find 2 options Find Teacher - Find language Partner , and then choose what language are you learning , you will find many people who are willing to help you and practice with you.
But if you are using italki from PC you can follow this step -> go italki Home and on the top of the site there's Community. on this option you will find Discussion - Answers - Articles - Find Language partner - Notebook.. etc.
it isn't that hard and good luck :)