Hello, friend!
If New is disabled on the port forwarding page, check the following items:
1. Check whether the account for logging in to the device WebUI has the operator permission.
If you do not have sufficient permissions, click: Huawei ONT login account and password
2. Check whether the product is customized for the ISP.
If the product is customized for an ISP, we cannot provide effective assistance to you. You can only contact the ISP to provide a solution.
Thanks!