FlashHax is a safe way to enable homebrew on a Wii without hardware modification. FlashHax is achieved by use of the Wii's internet channel which executes a homebrew application from the FlashHax Website. This exploit requires the Internet Channel.
An broadband connection.
The Internet Channel.
Go to the Internet Channel, then go to flashhax.com
Select your region.
The website will ask you to go and bookmark the page.
When you bookmark, run it from the bookmark page.
The HackMii Installer will run. After that, the the rest is simple, assuming you know how to use the HackMii Installer.