Portal Users cannot see the option to Run Process Button

HI all,

I create custom sections from scratch and in section page my integration developments are working ok but in the customer Portal nothing triggered (Is not showing the option to RUN BP manually ) . It looks like is a permissions issue. I tried to activate some permissions but still not working (in console I have Error 403).

P.S. Please find attached images for more clarification.

Could you please help me to find the solution?

Thanks,