Hello,
Try using the Console cable (light blue, RJ-45 to DB-9).
Connecting a PC to the Router Console Port
This step is optional; it is required only if you want to use the Cisco IOS CLI instead of SDM to configure or troubleshoot the router. To use Cisco IOS, you must connect the router to a terminal or to a PC with terminal emulation software. Terminal emulation software should be configured with the following settings:
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9600 baud
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8 data bits
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No parity bits
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1 stop bit
The Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide describes how to configure the router by using Cisco IOS software.
http://www.cisco.com/c/en/us/td/docs/routers/access/1800/1811/hardware/quick/guide/1811qsg.html
Configuration guide below
http://www.cisco.com/c/en/us/td/docs/routers/access/1800/1801/software/configuration/guide/scg.html
Hope this helps...