There are some pages here that I probably put because they're useful.
This guide will show you how to install the Homebrew Channel on Dolphin Emulator.

Open_HBC_1.1.5_LULZ.wad file from the Open Homebrew Channel page.Tools > Install WAD and select the Open_HBC_1.1.5_LULZ.wad you downloaded.Tools > Load Wii System Menu. The channel should now appear on the Wii menu.
Tools > Perform Online System Update.Config > Wii window in Dolphin Emulator.Automatically Sync with Folder. You may also wish to adjust the SD Card File Size.SD Sync Folder path into the Start menu to open it.