just follow the guide - your drivekey doesnt change anything...
I have looked and looked but I can't find any info on installing homebrew on a wii with FW4.0 that has a drivekey installed.... any help? links to where I can install software?
I agree with dogeggs, the drivekey doesn't change anything with regard to HB.
There are plenty of posts about installing HB from S, just g00gle bootmii.