Pledge campaigns
Two places named Campaigns
Campaigns in the sidebar (below Email) opens Pledge Campaigns — the list of campaigns you manage. From here you can add a campaign with + Pledge Campaign or open Manage in Planning Center.
Dashboards → Campaigns is a separate analytics view. It is not where you edit the public pledge form.
Open a campaign to see Overview, Pledges, and Settings. A share icon sits in the campaign header (left of a delete icon).

Settings holds the public form
The public pledge form lives on the Settings tab: campaign details, form access, appearance, and the public campaign link.
Collect pledges
Share the public campaign link from the share icon. Collecting pledges by bulk email is coming soon.