Colors are used to show the different types: Experiment Batch run Algorithm. Clicking the buttons will expand them and show more information.
All parameter changes happen in real time as soon as you change them. Pop ups will appear if your attention is needed for a specific part.
When you change a parameter from a task that falls under any repitition, the changes are pushed to all the other tasks too. The interface only shows the change for one task.
This screen acts as a staging area. When you have changed all the data to your wishes you can go to the bottom of the screen to upload the job and all its tasks to Hive OR you can save the job to a file again.