Read the warning- Hold B Press +/A to install
After priiloader installs, it may give error or freeze- this is ok
Hold reset and boot wii while holding reset- priiloader will load
If it keeps loading to Multimanager, then just do as the quote at the top that vinatec said to do. Remove the sd card, power off the wii, turn the wii back on and immediately hold reset until priiloader loads up. Then put your memory card back in. Or rename the bootmii folder like he says.