How to Switch Accounts on MT4 (Mac)
If you have multiple MT4 accounts, you can switch between them within MT4. Once your login information is saved, you can quickly switch accounts with just a few mouse clicks.
How to Switch Accounts on MT4
Log in with a New Account and Save the Account Information
Log in with an account other than the one you first logged into (the account you want to switch to).
Select "Login to Trade Account" from the "File" menu in MT4.
In the "Login" dialog that appears, enter the login ID, password, and server information sent via email. Check the "Save login information" box and click "Login" to complete the login.
Switching Accounts
A list of saved accounts will be displayed under "Accounts" in the Navigator within MT4. Double-click the account you want to log into.
The "Login" dialog will appear. Verify the information and click "Login" to switch accounts.