Hi i'm trying to make my site in hebrew.
The hebrew writing is right to left.
I need change title's align of all modules to right

how can i do this?

Have you had a look here:
Website Design and Languages Interview

thank you for show this interesting article
but i'm still (maybe because i'm very beginner)
not understand how can i access the HTML code of the module title
(i the article the author said i have to add "dir='rtl'" to  "" tag) 
where  can i access the HTML  to change the tables?

The HTML is in your skin file.

Thanks a lot to all hwo advice me!

Finally i managed to change the modules containers align!
with help of yours and of this site

I figured that its possible to change a style features by changing the
DotNetNukeWebsite1\Portals\_default\Containers\DNN-Blue\Image Header - Color Background.ascx

and

DotNetNukeWebsite1\Portals\_default\Containers\DNN-Blue\container.css

files







Again, thank a lot

You can do this in the container.css file, assuming that the container doesn't have alignment tags built-in.  You might be able to override using skin.css. 

The Web Developer's Toolbar that you can add to Firefox is a really powerful tool that can help you understand how the css works with the skin and container.css files.  You can see how to do this in Troubleshooting DotNetNuke Skins.