Quick access to guides on all features your mining contract provides
First and foremost, you can see all of your contracts of a single type by clicking the "Extend" dropdown button near the top left of the Summary box on your My Earnings Dashboard.
After expending the details, scroll down past your hashrate graph and you'll see all of your contracts of a single type here. This user has 3 bitcoin contracts with varying amounts of hashrate. Here, you can claim from an individual contract, see more details about a particular contract, or combine your contracts together for easier management.
You can also rename your contracts easily by clicking the pencil next to the Type column.