Set Up a Fund to Enable Donors to Make Online Pledges
This article provides information on what should be selected to enable Donors to make online pledges when setting up a new fund.
If a fund has been enabled to allow Pledges to be made online, a Donor can make a Pledge to a fund from the public site.
When Adding an Online Fund, to enable the ability for Donors to see a Pledge button and make Pledges from the public site, a checkmark should be placed in the box titled Display this fund on public giving site, and either Gifts and pledges or Pledges only should be selected.
Check this out for more information about Pledges.