What are you trying to do?

Your question doesn't really make any sense.

I want to access the admin panel of my second router. 192.168.1.1 gets me into the main router but I want to access another one

Unfortunately if both devices have their management interface on 192.168.1.1 you're not going to be able to access both (most likely you won't be able to access either).

You will need to change the management IP address of the second router to be on a different IP address eg 192.168.1.254.

There is no point having two routers in your network though...

If you're looking to use your second router as another WIFI Access point in different area of your home, still set the second router's IP address to a different IP address than 192.168.1.1 (eg. 192.168.1.254) and plug in the network cable to a LAN port on the router, not onto WAN.

kiwis: So I changed my ip to 192.168.1.90 and it works but 192.168.1.1 does it get my second router

If both are acting as routers and possibly DHCP servers, the one will be the gateway and the other will just be a troublemaker on the network.  Whilst you are configuring one or the other, set them up as if they were simply switches on your network.  I would suggest you disconnect from the Internet while doing all this.  No sense in giving away the farm.

I tend to set my main gateway as 192.168.1.254/32.  It seems that every manufacturer in the world likes to grab 192.168.1.1/32 and use it as the default.  If you plug that into an existing network which is default in the same manner, you will do just like the other fellow said, experience an IP conflict.  Something that might help is to literally draw up what you are trying to do and look at it.  Write down the IP addresses for each device, it's gateway, DNS servers, etc.  Just remember... if 2 routers exist on a network, something has to tell the other devices how to get there.  Routers work on layer 3... switches work on layer 2.  Layer 2 is about as simple as you can get... you plug it in and something will try to talk to it :)  Layer 3 is a little more picky.

Hope this helps... If not, I'm more than happy to help you sort it out.

Jase2985: Disconnect your pc/laptop and plug it into your second router, then change what you want/need on it then plug your
computer back where it was

kiwis:

I've plugged my second router into a Ethernet port in my house. Should I be able to connect to it?