How to edit an already existing road

Newbie here, how to you edit an existing road? What I need to do is correct some local roads where the bridge has been permanently removed so the maps don’t auto route through them. Can’t figure out how to do this. Thanks.

Hi,
did you check the beginners guide?

http://wiki.openstreetmap.org/wiki/Beginners%27_guide

We can help more if you tell us which Editor (JOSM/id/potlatch) you’re using.

Have also a look on : http://learnosm.org/en/