|When I say "install", I meant install the software from the included CD, because the router has no manualCD|
That's what I thought you meant. Look, I've setup a whole lot of routers and never once used the software that came with it. It isn't necessary and the router will work perfectly without it.
As to no manual, I find that surprising. I've worked with many Linksys products and every one of them had a manual in the box. You should be able to find the manual for that device on Linksys' web site or by doing a google search for "linksys e1000 manual"
The only problem is the E1000's settings website doesn't have WAN settings.
I suspect by "website" you mean the device's management interface which you access through a web browser. If yes, then I don't know what to tell you. Every router I've ever worked on had WAN settings that are adjustable because not all ISP's are the same.
At this point, the best advice I can give you is for you to call Linksys' support people and get their help setting the device up.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.