This is the IP address of your linksys router. If you click on the above link you will get a login prompt for your router.
It allows you to perform administrative tasks on your router. You will need to know the password. The default password is usually admin if you have not changed it. The user name could either be blank or admin depending on the router model.
You router manual should give you all the information of what you can do and how.
Here is some information on how to set up that might be of help:
☺ When everything else fails, read the instructions.