diff --git a/docs/deployment.md b/docs/deployment.md
index a897d06..84f0a34 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -45,5 +45,5 @@ Please follow this [guide](config/index.md) to configure it.
     poe 
     ```
 
-Then, open `http://localhost:9000/brickapi/v1/docs`. If the swagger API page is shown, congratulations!
+Then, open <http://localhost:9000/brickapi/v1/docs>. If the swagger API page is shown, congratulations!
 Now you can move to the [next step](init.md) in initialize playground.
diff --git a/docs/init.md b/docs/init.md
index 26482b4..5d822f5 100644
--- a/docs/init.md
+++ b/docs/init.md
@@ -1,16 +1,34 @@
 # Initialization
 
-## Register admin user
+In this guide, most of the operations should be done on the swagger API page.
+If you do not change port settings, it should be on <http://localhost:9000/brickapi/v1/docs>.
+
+## Register user
 
 === "Username / Password"
 
+    1.  Use the API `POST /brickapi/v1/auth/register` to register user.
+    
+        `email`, `password` and `name` can be set in the request body.
+    
+        ```json
+        {
+          "email": "user@example.com",
+          "password": "string",
+          "name": "string"
+        }
+        ```
+    
+    2.  Use the API `POST /brickapi/v1/auth/cookie/login` to login the registered user with cookie.
+
+        The `username` is same as the `email` set in the last step.
 
 
 === "Google OAuth2"
 
     Before using this, ensure that [Google OAuth2](config/auth.md) has been setup in the configuration.
 
-    Use the API `/brickapi/v1/auth/cookie/google/authorize` and it will return a json response in the format
+    Use the API `GET /brickapi/v1/auth/cookie/google/authorize` and it will return a json response in the format
 
     ```json
     {
@@ -22,9 +40,24 @@
     The page will be redirected back to the [FRONTEND_URL](config/backend.md#frontend_url) entry in configuration.
     By default, it is the url of the Swagger API if not set in configuration.
 
+!!! info
+
+    Use the API `GET /brickapi/v1/users/me` to check user is successfully registered and logined.
+    
+
 !!! note
 
-    The admin user can also be registered in the frontend.
+    User can also be registered in the frontend.
     However, it is recommanded to use the Swagger API for convenience of debugging the setup.
 
+## Set superuser
+
+Use the API `POST /brickapi/v1/users/init_superuser` to set the current user as superuser.
+This API can only be called when no superuser exist in the system.
+
+
+## Create domain
 
+1.  Use the API `POST /brickapi/v1/domains/{domain}` to create a new domain.
+    `domain` should be set to the name of the domain.
+2.  
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