Not the best practise for security reasons but
if you must, here is an example from Netgear. Something similar will apply for your Linksys. Make damn sure you really, really want to do this.
Remote Management Help
Using the Remote Management menu, you can allow a user on the Internet to configure, upgrade and check the status of your router.
IMPORTANT: Be sure to change the router's default password to a very secure password.
Turn Remote Management On
1. Click the check box to Turn Remote Management On.
2. Click the Apply button to save this change.
Remote Management Address
This is the current address you will use when accessing your router from the Internet. To access the router, you will type your router's WAN IP address into your browser's Address (in IE) or Location (in Netscape) box, followed by a colon (:) and the custom port number. For example, if your external address is 10.0.0.123 and you use port number 8080, enter in your browser:
Allow Remote Access
For security, you should restrict access to as few external IP addresses as practical.
Click Only This Computer to allow access by only one IP address.
Click IP Address Range to allow access from a range of IP addresses on the Internet, enter a beginning and ending IP address to define the allowed range.
Click Everyone to allow access by everyone on the Internet.
Web browser access normally uses the standard HTTP service port 80. For greater security, you can change the remote management web interface to a custom port by entering that number in the box provided. Choose a number between 1024 and 65534, but do not use the number of any common service port.
To Save Or Cancel Changes
Click Apply to have your changes take effect.
Click Cancel to return to the previous settings.
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