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Still not sure what your 'go to slot' option is (in designer?). When adding a new button, I usually follow the process below:

• Run designer on ui/main_window.ui
• Add a new button inside designer
• Save the designer update.
• In a shell, make clean and make (regenerate the code).
• In my cpp editor, add a slot callback function in main_window.hpp and main_window.cpp

Note that the slot callback function has to be named to match the action and the name of the button you added - this is qt's auto-connect feature. If you get the name right, you don't need to do any explicit connecting of button to callback in designer or in your code.