Just had a look at the article by Google about Buzzing on your mobile phone but some of the items do not apply to Nokia phone users, at least as far as I can figure out. We'll take them in turn and then reply in red.
1. Search for a place to post from
Tagging a post with your location is easy and fun. You can just tap the location box in the posting screen to add a place name or an address. Or, you can search for a place. Click ">" in the location box and scroll down a bit to find the search box. This will allow you to search for places nearby and tag your post with that location. You can only post from the location determined by Google using GPS or with a Nokia E63 mobile phone tower triangulation.
2. Learn more about a tagged place
When you see a location tag and the little red pin attached to someone's post, you might want to learn more about that place. Click 'Show map' to see the address of that place and a small map, which you can tap to see a bigger, fully functional map. You can also click the place link to view business details, reviews, photos, and more. Clicking on a location within a buzz will tell you more about the location and even give you the opportunity to get direction to the location, see whats nearby, add a star or call up the location on your mobile.
3. Choose to share privately or publicly
The Google Buzz web app provides options to share your post publicly on the web or privately with the groups you select. To create a new group to share privately, you'll need to visit Buzz in Gmail or google.com/contacts from your computer. Your location is attached to your post by default, either as an address or a place. If you don't want it attached, you can simply tap the 'Remove location' link. Next time you post, we will remember your choices for the sharing option (public or private) and for the location tagging option (whether or not to include location). For Nokia users, currently you have no choice but to buzz only from the location determined by Google. You are also unable to remove the location link. This may change in later builds.
4. View mobile profiles and follow new people
You'll often find interesting public posts or comments made by people you're not following yet. If you'd like to start following them, simply tap on their name to visit their mobile profile page, click the 'Buzz' tab, and tap 'Follow'. The 'Contact Info' tab includes info pulled from their public Google profile that they've chosen to share and any additional info you may have about them in your contacts, making it easy for you to contact them with one click. For Nokia E63 users, you can only view the person's buzz and reply to their buzz. Your location from which you reply will not be revealed.
5. Auto-finish @reply
When you want to include someone in a post or comment, you can use the @reply feature. On mobile devices, simply type "@user", which will be automatically expanded to "@email@example.com" for you. This will save you time typing on the phone. This feature is currently not supported in the Nokia E63.