You need to re-read the instructions in the Comtrend manual. You can't just type an address into the browser with that unit, there are changes to network properties that need to be made. It is all outlined in the 3rd chapter. To be honest though, that unit seems like a terrible PITA and an unnecessary headache.
I've never had to change any of the configurations in any of the Windows networking properties for any other router before like that one apparently requires. Normally, they can simply be accessed through a specific web or IP address.
I'd just get a newer unit that has a lot more features that that thing does, spend five minutes in the browser configuring it and then never think about it again unless you want to.
The unit I currently have, and I've had probably 50 different wireless routers over the years and installed at least 70 others, beats them all hands down. With MU-MIMO support and omni-directional beamforming I can get a fantastic wireless signal anywhere in my house, which is three stories of lathe and plaster walls, where previously I needed access points on the lower and upper floors or else I had extremely spotty signal strength and about half of each of those floors was simply a major dead spot.
Obviously that's an extra expense but you can get a VERY high quality wireless router with an Intel wireless chipset (Not the cheap chipsets used by most routers anymore) that allows for true multiple simultaneous signals instead of the typical stop-go-stop-go method used by all non MU-MIMO units. It makes a huge difference if you have multiple devices that simultaneously connect, like phone, tablet, laptop or smart tv.
Before, if we were accessing content on our Firestick and one of us started doing something on one of our tablets or laptops, we could tell right away on the tv. Now, everything is smooth. I used to dismiss the relevance of bells and whistles on wireless routers as having little benefit in real world application but after seeing what the advancements in these MU-MIMO beamforming units can do, I'd never buy a regular budget router again.
And the model I had before wasn't a hunk of crap, it was a WNDR 4300 N Gigabit router, and it cost me over a hundred bucks when I bought it, but this unit I just got a few weeks ago has really been amazing and LITERALLY it took five minutes from unboxing to done, to set it up including the configuration.
Probably as Drew has said you can simply get by with ditching one of those devices, or maybe not, I don't really know the specifics of why it was done that way or what devices you use, or what sort of distances you are needing to have coverage of, but if not and you'd like a recommendation on a good unit I'd be happy to drop a couple model numbers that I feel are rock solid choices.