From the screenshot it looks like your resources have arrived just fine and you only have to unload them with the 'Unload' button (in the left bottom corner of the screen you made a screenshot of). After unloading these resources you will be able to start a new transport mission.
Have you tried clicking the 'Unload' button? If you did, what happened after you clicked it?Edit: Seems like we had some technical issues on Friday. Because of this the transport missions weren't available for anyone. Right now everything should be working again.
If you're still having trouble with your resources/transport missions, then please let us know.