First you need to either know the root password or you need to set the password for another user.

(Installing ssh on the device forces you to change it anyway!)

Then get your devices ip (i am using wireless) - In terminal type
and press enter

In the result you will get something that looks like the IP.

One you know that complete the winscp screen like this:

Click Login

Enter the root password!
(Done!)


If you the login box stalls, try connecting to a website, anyone on your n900, and either wait or rety it - sometimes the n900 just needs a wake up