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Kind of a crappy screenshot, but to further Samoht's point, in the above the hotbar is on the left, and the abilities bar is in the lower right.
Since you are using /doability 4, then Forage needs to be on the abilities bar in position 4 (where Sense Heading is in the above screenshot). Then make your social macro, move it to the hotbar, then hit Alt-O to bind the movement key of your choice to the same hotbar position where you placed the social macro for forage. The hotbar numbering follows the same pattern as can be seen in the abilities bar above.