You can't just change it to static, much as we'd all prob like to
All of that is up to your ISP, and since a static IP enables us all to easily run server applications from home, DHCP is usually the norm. I called my ISP, and they want an extra $50 a month for 'professional' service with a static IP address. First of all, you would need to obtain that permanent IP address from your ISP. Otherwise you wouldn't be able to set it up in the first place.