Open your browser (Chrome, Internet Explorer or whatever you use) and go to https://pcmedia.maxdesk.net. If it's the first time you've gone there, you need to create a login. Use your school email, and whatever password you want. Then login and 'Submit new ticket'.
Hit windows and search for ‘mouse’ or ‘pointer’. You are looking for ‘Change the mouse pointer size’. Click here to view screen-shot.
Click here to view screen-shot and instructions.