Yes, you can have a maximum of 3 live trading accounts.
In order to request for a new trading account please follow the below steps :
1) Login to your client portal from here
2) Click on Add account
3) Select Live Account
4) Select the type and currency an the reason for the additional trading account.
5) Enter your client portal password and click on submit.
You will receive an email that contain your new trading account login credentials.