To fix it yourself, I suggest you go to http://www.waze.com/editor and watch the video and work in the 'play mode' for a while after you read the wiki.
If you want someone to fix it for you, after you go to the editor and enter the play mode and find the spot on the map that needs fixing, then click on the 'from segment' and right click on the 'perma-link' in the right bottom corner of your screen.
click on 'copy link address'.
Go to viewforum.php?f=199
and paste the 'perma link' into the message you post asking for someone to check out the problem and explain what it is.
Be sure and put your location IN the title so that people looking for things to fix know if it is in an area that they can work in.
Hope this helps.