feat: add instructions to send SuiNS NFT to the CLI address

Author: giac-mysten

docs/assets/suins-asset.png

@@ -0,0 +1 @@
+# The Walrus Sites Portal

docs/walrus-sites/portal.md

@@ -0,0 +1 @@
+# The site builder

docs/walrus-sites/site-builder.md

@@ -9,10 +9,6 @@ Let's do this step by step.
 
 ## Get a SuiNS name
 
-IMPORTANT: for this to work, the wallet with which you purchase the SuiNS name should be the same as
-the wallet you use in the Sui CLI. Unfortunately the SuiNS interface on Testnet does not allow
-setting the resolution through the UI.
-
 - Navigate to [https://testnet.suins.io/](https://testnet.suins.io/), and buy a domain name with
   your testnet wallet. For example, `walrusgame` (NOTE: this is already taken, choose another you
   like!). NOTE: At the moment, you can only select names that are composed of letters `a-z` and
@@ -23,6 +19,25 @@ setting the resolution through the UI.
   info", and copy the `ObjectID`. In our case, this is
   `0x6412c4cfbe50e219c2d4d30108d7321d064e15bf64e752307100bff5eb91da38`.
 
+## Send the SuiNS registration object to the address you use with the Sui CLI
+
+The steps that follow require that the registration object is owned by the address you are using on
+the Sui CLI.
+
+To find the address, execute:
+
+``` sh
+sui client active-address
+```
+
+Then, from your browser wallet, select "Assets", look for the NFT of the SuiNS registration, which
+should look as follows:
+
+![the SuiNS registration inside the wallet](../assets/suins-asset.png)
+
+Click on it, scroll down to "Send NFT", and send it to the address discovered with the command
+above. Now, your Sui CLI address owns the registration NFT, and you can proceed to the next step.
+
 ## Map the SuiNS name to the Walrus Site
 
 This step associates the name `walrusgame` to the object ID of our Walrus Site. There are possibly