ssh login to OpenWRT

You need to have set a password on the webinterface or with telnet. If you use linux just install ssh on your computer and type the following commands into the shell:
ssh root@IP_of_your_router

If you had a ssh server running on your router before flashing it, you have to delete the directory .ssh in your home directory.

If you use windows download putty, execute it and consider changing your OS to an open source alternative ;)
In the window opened by putty type in the ip of your router, connect and login as root.

Now you should be seeing something like this:

We need a FTP-Server for easily changing the configuration files on the router.