Click on the images to see a bigger version

When you log in you should see the following
When you click on assignments on the left toolbar you should see the following:
When you click on "Assignnent 1.1" you will should see the assignment like this:
Scroll down to to the bottom of the assignment page and you should see this:
The submission textbox is not important. You dont have to put anything in there. But you will want to attach the ZIP file that contains all the .java files. For this click on the "Add Attachments" button. Now you should see something like this:
We dont care about the "My Files" section. Click on "My Computer" and you should see something like this:
When you click on the "Browse" button, a file browsing dialog will show up. In there find the .zip file that you would like to submit and press "OK" or "Open". When you're done with that, you should see something like this:
Scroll down to the bottom of the page and press the "OK" button. You can see this here:
After you've done that you should be taken back to the assignment page where you previously clicked "Add Attachments". Now it should look like this:
Press the "Submit" button on this page (same page as shown above) to submit your assignment.
After you pressed the "Submit" button you should see the following:
At this point, if you click "OK" or click on "Assignments" on the left you will be taken to the assignment inbox which should look like this:
Clicking on "Submitted" you will see your submitted assignment:
You're now done submitting the assignment. If you want to make some changes and re-submit your assignment click on "Assignments" and then "Submitted". After that, click on the little grey box on the right of the assignment name. At this point you should see something like this:
Click on the "Take assignment back to inbox". Now the assignment will appear in your inbox:
Repeat the procedure from the first step to submit a new version of the assignment.