If you would like to make a donation "On Behalf Of" a student, 

After clicking the "Give" button on the campaign that you are donating to, there is a "I am giving on behalf of" checkbox that, when checked, will open Student Name fields for the student whom you would like to donate on behalf of.

Enter that student's first name and last name and continue with the process.  You can also enter a note as to why you gave, 

After making the donation, if you go to the "Backers" section located on the campaign page, your donation will be listed.  The name of the student whom you donated on behalf of will appear first on the left side (while your name as the donor will be shown as "Paid by Your Name" to the right of that.  Below this, you will see the message that you left.

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