To sign in, use your existing MySonicWall account. To create a free MySonicWall account click "Register".
On the home page (or dashboard) of your TZ270w, click on the Policy "tab" along the top "menu" (I am putting these words in quotes because I do not know the official SonicWall terminology and because they really aren't those things, either).
Now, on the left-hand menu, click the Security Services label to expand the group.
You will find the Geo-IP Filter entry in that list. Click on it to get to the windows appropriate for setting those options.
Hope that helps!
If you are having trouble finding something in the new UI, please use this global search button. You will get direct links to the page you are looking for.
Also, moving this question to the Entry Level Firewalls category.
I hope this helps in the future.
Technical Support Advisor, Premier Services