Thanks for your quick response.
This helped a lot.
I keep on trying?

<t>Hi everyone<br/>
I'm a new Sweet Home user and I enjoy it.<br/>
During my fist project I have encounterd a couple of challanges which I'm sure you can help me with.<br/>
1. When I started to draw the top level, how do I add one below?<br/>
2. How can I create a roof?<br/>
3. How can I creat a ...