Go to Management and go to Projects. Click the blue 'edit' button at the Project 'Correspondence Networks' to edit the Project you created earlier.
Click on the tab 'Organise'. For each Type and Classification enabled in this Project you see a tab. By clicking on a tab you see a number of settings that can be configured per Type and Classification.
To change the order of the Types/Classifications, as they are listed in the Data section, click and hold one of these tabs. Once you have grabbed a tab, you can move it to the desired position. Do this for each Type/Classification you want to move.