Open the Citrix Receiver app from your Applications folder
The first time you open the program, you'll need to access the Preferences menu from the Citrix Receiver pull down menu in the top left of the screen
Under the Accounts tab of the Preferences menu select the + to add an account and type https://xenapp.win.admin.reed.edu into the blank
It will take a minute to connect, and then you will be prompted for your credentials. You'll need your Admin password (same as Homeserver) and usual username, but with "admin\" in front.
Click Log On and add the ACS Explorer app using the + on the left hand side
Click the + and select the applications you want from the All Applications menu
This will add a permanent icon to the Citrix Receiver homepage
Double click the icon to open the program