how i can change customer portal ip address
You should provide more details, but from the question it seems like you use the Desktop version and thus would give an internal ip of something like 127.0.0.0 that is because the customer portal can only be used by the Cloud and Server Editions both of which could provide public available IP addresses that are accessible on the internet.
See also Establish customer portals | Manager
In the desktop edition, all features described in this Guide work, but only on your computer. A customer visiting the hyperlink for the portal would not be able to access it.
In the server edition, the hyperlink will direct the customer to your own server. Therefore, in order to function, your server must be online and accessible by the customer.
In the cloud edition, the hyperlink will direct the customer to your Manager cloud server. You do not need to be logged into your account for the customer to access the portal.
Am lost please, is customer portal now available on manager accounting?
If yes! How do i go about it please?
Read the guides Establish customer portals | Manager and search the forum. It is only available with Cloud and Server editions.