2. Now you can choose origin city (3) from which resources will be send, and target city (4) where resources should be delivered. You can put manually destination X|Y coordinates, whatever you want. They don't need to be only of your cities.
3. Fill the rest required data (5). All data is similar to sending army task. Resources sending work the same as sending army. The only one differece is on final stage of task. Instead of going to place and send army, bot go to market and send resources to target city.
4. Once you fill all data, click "Add/+" button (6).