Login into your account By clicking on Join/sign link from the top right corner. The click on the create new website button as shown in below image.
After clicking on Create new website button choose a them and start creating your new website.
When you edit a website/template for the first time, click on SAVE button to Save it into your account from next time please click on Publish (Green button right corner) button to Save the changes in your website instead of clicking on SAVE button
2. Click on Publish button to Save the changes you made in your website. Clicking on Publish button also generates a Free preview Domain.