how to create theme and set up, thread id like to know

Check out the faq.

but as the id of the topic, explains as preguatas do not know pa id of the topic, if you were kind enough to explain ta

There are many forums that give me error message

You probably have wrong settings.

1. Wrong type.
2. Wrong url.
3. Wrong id (if it's topic, make sure it's topic id, not the post id).
4. Other your own mistakes.

Check the faq for "Posting problems tips.".