How to configure the url aliases in drupal

How to configure the url aliases in drupal for friendly urls.
suppose your url like :

http://www.yourdomain.com/node/1

this page for about us page, then we can convert into in your friendly urls like

http://www.yourdomain.com/aboutus

for this we have to follow some configuration in drupal:

1) Administrator -> Site building -> URL aliases
2) Click on Add alias – then it go to form admin/build/path/add
3) Give the Existing system path like:


node/1
to Path alias:
aboutus

see the below image :