URL change problem

hey I ve got one smoewhat tricky problem:

i want to change the url of my wordpress.

I ve got several urls for the same webserver and

I one to choose a new one.

I ve tried different solutions:

editing the db directly, editing the functions.php

this lead to the wordpress page showing up but not

the wp login.

I also tried the wp-config solution but this didnt work aswell.

any ideas?

any help would be highly appreciated !!

thx!