Use the below link to make donations.
You can select to either make a one time donation or setup for recurring donations. If making a one time donation it is not required to create an "Online Profile" or to "Log In". For making a one time donation, all you need to do is enter your donation amount, select "Once, now" in the "Frequency" drop down list, click on the "Add to basket" button, and then click on "Continue to Payment". You will then be redirected to the "Payment Method" page to continue the process.