>When you enter code between brackets and u type the last bracket, the whole piece of code and the brackets is highlighted. How can u stop this from happening?

Why would you want to? The highlighting helps you see whether you've properly matched the parentheses, and disappears fairly quickly.

However, you can change the duration by setting "Highlight duration" on the Editor page of the Options dialog. Setting it to 0 turns it off.

Tamar