Needing to attach parts from your tool can be difficult without instructions. While you are waiting on an expert to answer your question, I was searching your model number you have provided and it seems to be incorrect. A suggestion I have is to look over your model number and attach it to this thread below. Hope this helps!
I am sorry you are having a problem with removing the beater. To remove the beater, push up and turn it to the left. Then pull down on the beater. I have also provided you with the instructions out of the manual in the image below.
I will also email a copy of the manual to your email address we have on file.
Please let me know if you need further assistance with the mixer.