I am assuming that you already have a Google Wave Invite.
Step 1. Please login to the sandbox server. This itself presents a feat, as it is not clear how to do so. There are no links from the API docs to the sandbox server only from the invitation email – I understand the reasoning, but not very user-friendly.
Currently, there is only one Google Wave server -https://wave.google.com/a/wavesandbox.com/.
Step 2. Create a new Wave that you would like the public to see. I use the term public loosely. Currently, it is rather elitist crowd flashing their invites left and right on Twitter. Once you create Wave, notice a small Debug menu link in the top-right corner. Choose the Wave Id menu option, you will need to substitute this in the sample HTML that tutorial provides.
Step 3. There are also couple of useful robots that aid you with the embedding of Waves. For example, Embeddy - embeddy@appspot.com posts a usable tutorial HTML with the Wave ID already substituted for you. Also, there is Madoqua Wave Bot blog-bot@appspot.com that print the id for the Wave you are in (be carful HTML created is using production server that is not live yet).
If you are planning to make available publically, do not forget the bot that allows public access - public@a.gwave.com. Hint: first add this address to your contacts, and then add this bot as a participant on the wave – he will add everyone to your wave.
Step 4. So, finally, you are sick of my rumbling and you have a page that contains HTML similar to what Embeddy posted on your Wave.
Refresh the page, if you get a blank page, most likely you are running Firefox. Firefox(below 3.5) is not friends with HTML 5 and for best results use Safari or Opera.
If the page asks you to login, open another tab, the login process will not redirect you back to your page.
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