You add data to the data table by opening it and manually adding rows.
There is no way, through blueprint, to change the data table. Maybe it would be possible through C++ to somehow write to it and update it during play but I wouldn’t know how to do that.
Now I see that I’ve not been clear enough when first posting the question. Yes I know that I can manually add rows in the editor, but I wanted to know if there was a way to change the data in the rows in runtime using blueprints.
It’s weird that there is an entity such as data table in Unreal, but no implemented functions for it to change or add new data to it. Then why make such a feature in the first place when you don’t give full functionality over it.