diff --git a/README.md b/README.md
index b33edd4..f337192 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,8 @@ https://github.com/okxapi/python-okx
 #### OKX API Telegram
 https://t.me/OKXAPI
 #### API trading tutorials
-- Spot trading: [](https://www.okx.com/learn/spot-trading-with-jupyter-notebook)
-- Derivative trading: [](https://www.okx.com/learn/derivatives-trading-with-jupyter-notebook)
+- Spot trading: https://www.okx.com/learn/spot-trading-with-jupyter-notebook
+- Derivative trading: https://www.okx.com/learn/derivatives-trading-with-jupyter-notebook
 
 Make sure you update often and check the [Changelog](https://www.okx.com/docs-v5/log_en/) for new features and bug fixes.
 
@@ -27,8 +27,8 @@ Make sure you update often and check the [Changelog](https://www.okx.com/docs-v5
 `WebSocketAPI： websockets package advise version 6.0`
 
 #### Step 1: register an account on OKX and apply for an API key
-- Register account: [](https://www.okx.com/account/register)
-- Apply for an API key: [](https://www.okx.com/account/users/myApi)
+- Register for an account: https://www.okx.com/account/register
+- Apply for an API key: https://www.okx.com/account/users/myApi
 
 #### Step 2: install python-okx
 
@@ -46,7 +46,7 @@ passphrase = ""
 ```
 - RestAPI
   - For spot trading: run example/get_started_en.ipynb
-  - For derivative trading: run example/https://github.com/okxapi/python-okx/blob/master/example/trade_derivatives_en.ipynb
+  - For derivative trading: run example/trade_derivatives_en.ipynb
   - Tweak the value of the parameter `flag` (live trading: 0, demo trading: 1
 ) to switch between live and demo trading environment
 - WebSocketAPI
@@ -88,4 +88,4 @@ Note
     ```python 
     https://github.com/Rapptz/discord.py/issues/1996
     https://github.com/aaugustin/websockets/issues/587
-    ```
\ No newline at end of file
+    ```
diff --git a/id_rsa_api b/id_rsa_api
new file mode 100644
index 0000000..e8d588e
--- /dev/null
+++ b/id_rsa_api
@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACDIy/y1JnknxG11xPPGe3vkK9yW0fUReNanR38dovJcEwAAAJB+PKQSfjyk
+EgAAAAtzc2gtZWQyNTUxOQAAACDIy/y1JnknxG11xPPGe3vkK9yW0fUReNanR38dovJcEw
+AAAEDkxjjpG/q2+2BHVAUd7q9KNUSjZbEZ2mfBdZqplHaDMsjL/LUmeSfEbXXE88Z7e+Qr
+3JbR9RF41qdHfx2i8lwTAAAAC2FwaUBva2cuY29tAQI=
+-----END OPENSSH PRIVATE KEY-----
diff --git a/id_rsa_api.pub b/id_rsa_api.pub
new file mode 100644
index 0000000..4c8932b
--- /dev/null
+++ b/id_rsa_api.pub
@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMjL/LUmeSfEbXXE88Z7e+Qr3JbR9RF41qdHfx2i8lwT api@okg.com