How to switch between my Sandbox and Production account?

I am login in My Sandbox Account and I want to switch to my Production Account

Step 1: you should click in the Switch to Production

Step 2: Enter the same and password in your production account.

Step 3: After the first login in your production account, you will be able to change your password in both account

I am login in My Production Account and I want to switch to my Sandbox Account

Step 1: you should click in Switch to Sandbox

Step 2: Enter your user and password in your sandbox account.

Step 3: After the first login in your sandbox account, you will be able to change your password in both Accounts