If you look at the top of the site under decks, you will see the link that lets you build your own sample LON deck. Here are instructions on how to use this feature:
1. Click on Create Deck. Give the deck a name appropriate to they type of play you would expect to use the deck for. Then select the archetype and write a brief description about the deck. All of this information can be edited in after you create the deck if you prefer to wait.
2. After you hit create, you will be brrought to your deck list. Click on Edit Cards next to the deck to add cards to it.
3. Use the search to look for the cards you wish to add to the deck. It defaults to bring up every card in the archetype you selected. When you find the card you want, click on the number next to it to add that many of that card to your deck. Continue this process until you have added all of the cards you want added.
4. Once the deck is complete, go back to the my decks page and hit edit deck again. Check off the finished button and save and your deck will now appear on the website.