Need help installing .deb package

I just downloaded the Opera .deb to my /home/[user] partition. How do
I install it? What directory do I install it to? What are the
commands and do I need to be root? I want it installed so all users
can use it.

I've used apt-get install to download and install packages before, but
for a package that's already been downloaded, I don't know what to do
with it.

Thanks,
Siri Amrit
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