Downloading MySQL has crashed my Mac

[Leo Allan]

Hi, yesterday I downloaded MySQL server from the website to my MacBook Air. I followed the instructions but something went wrong at the final instructions when I launched the terminal session from my utilities. I just followed the instructions on how to install MySQL for Mac and this code was included:

I entered the code cd/Library/StartupItems/MySQLCOM
ls - al
sudo chown root: wheel *
cd ..
sudo chown root:wheel MySQLCOM
touch .bash_login

Then I stopped and closed my computer. When I put it on all my files had gone and the settings were changed. It has gone back to basi/original mode - all I wished to do was install MYSQL but the programme seems to have taken over the entire computer.

I contacted Apple yesterday evening but they suggested contacting MySQL.

I'd be very grateful please for any help. I'm not an expert and have tried to explain the issue as best as I can above.