How to open MAME configuration menu? (normally tab)

When I press tab in mame, nothing happens. I’d like to change a dip switch with it. How do I open it in Retroarch?

Which version of MAME? If the 2015 version, tab works for me.

I’m using the mame 2015 version, yeah. Huh, odd, it doesn’t work for me. Do you know where I can find the setting in retroarch.cfg?

edit: Nevermind. I forgot the tab thing isn’t a key for Retroarch, but a key for mame itself. So I went to my mame rom folder, went into the mame folder, deleted default.cfg and it worked :smiley: