In the window panel you can open appearance for adding new stroke to your selection. Another hack for you to achieve this result, select any shape, make a copy with ctrl c and paste above with ctrl f, select the above copied shape and make it black, increase the size a little more than the original font while pressing “alt” to maintain the position, then press “ctrl shift [” to send the black copied shape behind the original font and it will act as a stroke, select both and right click to group.