The Create Product button will only appear if the correct setting is activated in each AdHoc Mini Market to activate this button navigate to the following page.
Click into the Admin Cogs along the top bar.
Click into Mini Markets on the left.
Click into Manage Mini Markets.
Click Edit on the mini market you need to update.
Click into the Details tab.
Open up the sub header Order Placing.
Ensure the tick box Order custom / purchaser products is checked.