Could you please post the link that led you to this forum address?
This forum is only to discuss how the forums operate, not products
For product specific questions you will do better in the specific product forum
If you start at the Forums Index http://forums.adobe.com/index.jspa
You will be able to select a forum for the specific Adobe product(s) you use
Click the "down arrow" symbol on the right (where it says ALL FORUMS) to open the drop down list and scroll
Welcome to the forum.
Unfortunately, this is the Forum Comments Forum, which is for discussing the Adobe Forums themselves.
I will Move your thread to the Photoshop>General Discussions Forum, which is very active, and very helpful. Your link and any e-mail subscriptions will follow perfectly.
Also, as most responses will be in English, you can use the Translate botton, to translate for you.
[Moved to the Photoshop>General Discussions Forum]
Can you tell us more about how you want to "clip" your Image, and how you wish to change the Background?
Attaching the Image (JPEG, or PNG) would be helpful, so that others can see what you have, and exactly what you want to do.