Setting up Remote Desktop

[sovrce]

When I go to set up RDP on my laptop, it asks for "Computer" & "User Name". Well I think I found my Computer's name - when you go to System and click the Remote tab, it displays: 'Full Computer Name' - so I *think* I'm set there (right?) My problem is that for "User Name", when click the Start button, at the top it says "Administrator". So when I fired up RDP on my phone and filled out the information, it came back with:

"Cannot connect. Likely reasons are: 1. Specified computer name or IP does not exist 2. A network error occured while establishing a connection"

I will say that I HAVE checked the Firewall Exception box that allows for Remote Access and I have also allowed users to connect via remote access through my System window on the Remote tab. What I HAVEN'T done, however, is anything in the way of port forwarding for 3389. I'm more than familiar with networking and working with routers, so that's not my issue. My issue is, if I'm supposed to forward a port to my IP address, how can I do that when all I can change is the last number:




1 - Is my user name being 'Administrator' a problem?
2 - How do I forward the ports, or work with this end of RDP? I've read about the DNS, but don't know exactly how to go about doing it.


I've been in my router before and changed some settings for the Xbox, so I don't think that has to do with DHCP on my local machine here, but correct me if I'm wrong. My question/problem is that this is set to "Automatic Configuration - DHCP"...



...is this a problem? Do I need to change this at all, as in, get in contact with my ISP and go through this setup? Furthermore, if I DO end up having to change this, will it affect anything else on my network? Some people just said they checked the exceptions and logged in without configuring a DNS, so I'm wondering exactly what all I have left to change?