scratching posts

Question
How to make my cat scratch on her scratching post not on the furniture ?

Answer
Mado,

You need to make the scratching post attractive to the cat and you need to show her that the scratching post is hers, but the furniture isn't.

Suggestions:

Put tin foil on the corners if it is a sofa she is scratching

Use a rolled up newspaper to swat her when she starts to scratch the furniture, then love on her a few minutes later. You want her scared to scratch the furniture, but NOT scared of you

Get a scratching post that has sisal rope (hemp rope). They like that MUCH better than carpet.

Rub catnip on the scratching post

Get a tree 'kitty condo' that the cat can scratch, climb on, and sit on (preferably where she can look out a window).

Keep the cat's claws trimmed! Here is a website that shows with photos how to trim a cat's claws:(copy and paste, or type, the whole link into the address bar)
http://www.cat-world.com.au/catclaws.htm

Note: Do not declaw! Declawing is an agonizingly painful procedure that may destroy a cat's trust in people for life. Declawed cats may stop using the litter box because it hurts them to walk on uneven surfaces. Declaw wounds may continue to cause pain for months or years. (Note that declawing cats is illegal in many countries, and in some municipalities in North America.)
Here are a couple articles to read about declawing:
(copy and paste, or type, the whole link into your address bar)

http://www.declawing.com/
http://www.hdw-inc.com/declaw.htm
http://cats.about.com/cs/declawing/a/declawing.htm

I hope this helps!
Tabbi