Step 1: Make sure the client is updated and synced. - Back it up too!

Step 2: Get 50,000 SiaCoin from an exchange and transfer them into your wallet.

Step 3: Unlock your wallet

(Not needed on updated client) Step 4: Forward Ports to either :9981 or :9982

Step 5: In the Hosting tab click "Announce" - this can take a few hours to propagate the network.

Step 6: Set your file contract price - remember it is a market so you may have to be competitive to get contracts