What exactly do you mean by "Im trying to add my account number"?
What account number and what exactly are you trying to do?
If you want to port your phone number from your old provider to 48 then follow the instructions here:
If you're trying to do something else then you'll need to explain more clearly what it is and what issue you are having.
If you need to contact 48 support about this then see the links in my signature below.
