You must be logged into your store admin (yourdomain.com/wp-admin)
NOTE: This is the same footer that will appear on the checkout Cart page.
1. Click T-REX from the left navigation pane
2. Click Campaigns
3. Click the title of the Campaign that you would like to open, ie. "Dad Est"
4. Scroll down to the Columns section
5. Scroll down to the Footer Right Content or whichever footer section contains your phone number
6. Edit the phone number text (highlighted in light blue below)
7. Click the pencil icon to edit the link
8. Change the phone number, leaving it in the format shown in the example below
9. Click the return (arrow) button to save the link changes
10. Click the Update button to save all changes
View the campaign page on your website, refresh your screen to make sure the changes look OK.