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Go to Users tab and click on the username you want to associate with a specific program. Select CommTrack, in the dropdown menu select your program, and update CommTrack Settings.
How to Associate Programs with Products?
Go to 'Manage Products' Section under Setup tab. Click the product you want to associate with. Select 'MCH' or other programs you created, and click Update Product. You will be automatically brought to the Manage Products screen and see the update (By default every product you created is associated with 'default' program. If there is only one type of medicine being tracked, you can just leave it unchanged).