Problem 403 and button of update WPBakey page builder not working

Hi sir,
please i have probleme of 403 permession, and i try lot of solutions to fixed but not working.
for example when i will change image or text…, the button of update WPBakey page builder not working.
and when i chnage form edit page show this error 403.
please help me i’m so late.
thank you.