Update demo/try it! instructions

docs/src/demo.md

@@ -1,8 +1,16 @@
 
 # Try It!
 
-Pick any Blob on devnet and measure its load time into your browser:
+You can load your own Blob ID with the following URL pattern:
 
-Blob ID or SuiNS name [    ]
+`https://cdn.suiftly.io/blob/{Your Blob ID}`
 
-Note: This is not implemented yet
+Example image: https://cdn.suiftly.io/blob/fK7v0bft1JqVbxQaM_KJAYkejbY9FgU9doqZwg7smw8
+
+Notes:
+   - The first time will be slow because your blob is being retrieved with Walrus and cached by Suiftly servers and globaly by the CDN.
+   - For now, the blob size is limited to 200 MiB.
+   - The CDN has 10 PoPs around the world and is DDoS protected.
+
+
+Stay tuned, this is just the first feature!