Goodman furnace - C Wire connection
You should be able to use that screw terminal for the C wire in the bottom picture.  I assume that the blue wire on the spade terminal goes to the 24v transformer?  It looks like the transformer has a red wire and a blue wire coming off it.  The red wire from the transformer is the "R" and the blue wire would then be the "C" wire.

Looks like an easy hookup - on some older units to have to hunt around more to find a good connection point.