Bad platform, extremely difficult for beginners. Help is non-existant, if you can't find answers in their blog or online help section you're screwed. You can reach out to their live help but they will give you the most basic & slow response (I think they are based in Europe) and direct you to the online help section and blog you've already exhausted looking for answers that aren't there.
I inherited an app that was designed in 2014 using html code. They have a new interface where you don't need to know code, unfortunately my old app can't be modified using the new interface so I have to update the code and I do not know html code. Also, you can't delete and app and replace it you have to pay for a new one.
Bottom line, GoodBarber is a horrible app builder, hard to use and no help system in place. Best idea would be to pay someone to create your app for you and save yourself the frustrationg and time suck of trying to use this platform.