First question: I was trying to preview my work using the previews options ("preview" and "preview on" (browser)) on RLM pro, but I can't see my image, what can I do in order to see it?

Second question: I made a menu for my site using "unordered list" option, it works fine, but how can I center it?

Third question: Is it possible to put a background image or background color for my site, if yes, can you explain to me on how to do it

Thank you

Hello Luis,

General recommendation - become familiar with and refer to W3Schools tutorials often!
http://www.w3schools.com/css/default.asp

Q1 - Preview with images in place, not that I know of - without exporting with the correct paths set and then viewing the results in a browser.

Q2. The way I did it - leave it be in RLM Pro then create a custom.css file, adding the external stylesheet link using coffee cup html editor, and addressing the centering within the custom.css file by ID
(example) #my-obj-id { text-align: center; }
or by class
(example) .my-obj-class { text-align: center; }

Q3. Again - after completing the layout - adding the background using CSS, via the custom.css file.
(example) #my-obj-id { background-image: url("images/my-bg-img.jpg"); }

Hope this helps!

Sincerely,
Gordon