By default in WHM resellers are not allowed or this option has not been added in WHM to change their website IPs. IPs assigned to them can be used. New account will be created with new shared IP. And for dedicated IP client has to create a package and specify in it. That would then assign
the IP on creation from the IPs assigned to reseller. If want to change IP for existing accounts then root has the right to do that so you can leave us a ticket and we can change the IP for for existing account(s).
In order to submit a ticket to our support, please follow the link below