If you want to change the columns that are listed on contacts, accounts, etc., you can click on the Gear icon and then the Configure Columns menu item.
You will see a list of available attributes on the left and the current columns on the right.
You can drag-and-drop attributes from the left to the right to change which columns are displayed.
When you are done, click Save and you will see the new column displayed.
If you are an Administrator and you want to make these columns the default for everyone, you can click the Save View button.
Then select the 'Use current columns as the default for everyone' and then Save.