Paula's questions

I'm new at Ubuntu so I don't know very well how to use the terminal in order to download and install programs that aren't in the software center. I've tried without success downloading and installing Handbrake.

Could anybody help me, guiding me through the downloading and installation of Handbrake?

I'm sure my username and passwords are right. Don't know what's wrong, I could login with my google talk account. Has this happened to anyone or do you know how to solve it? Thanks!