Open the photo with a background you want to change in Picsart.Press the back button, swipe to go back, or hit the cross icon at the top to discard the Picsart Gold screen. Note: you may be asked to get the premium version of Picsart several times while using the app. Alternatively, tap on the “Skip” button at the top.
If this is the first time you are using the app, you will be asked to create an account.
Changing the background of a photo in the free version requires you to remove the original background, then add a new background. However, the free version has no such option. The premium version of Picsart, aka Picsart Gold, offers a direct swap option to change the background of photos. How to Change the Background of a Photo in Picsart for Free