Once logged in, go straight to the set you want to edit, or to your sets overview page. You can use your sets menu in the top right hand corner of the page to get there. (Need some extra help?)
Select the "Edit" button next to the set you want to change.
From the editing page you can change the name, description and tags for your set.
All the items included in your set are listed down the page. You can remove items by selecting the "Delete" button to the right hand side.
To the left hand side of each item is a grey dimpled tab.
Use this to drag the item further up or down in the list and rearrange the layout.
Changing the vertical order of the items will change the layout of your set when you view it.
The item at the top of the list always appears prominent when you view your set.
Remember to click the "Save" button.