Go to the campaigns tab and click 'New'. To duplicate an existing campaign, click the copy icon next to the campaign.
Enter a name for the campaign. You can also change the campaign slug/URL if you want it to be different from the campaign name.
Set the campaign’s display currency. This only affects how amounts are shown (for example, the goal in the progress bar). Donors can still give in any available currency.
Customize the campaign settings. Any settings you set (descriptions, colors, amounts, etc.) are specific to that campaign.
Campaign URL is the campaign identifier used in URL's and Java Scripts (for custom buttons) to open specific campaigns.
For example, if your campaign URL is giving-tuesday, the link will be https://yourwebsite.org/?campaign=giving-tuesday, and the Java Script will be: onclick="Double.openCheckout({campaign: 'giving-tuesday'});"