From the Manchester Council website.
With a Blue Badge you can:
• park for up to three hours on a single or double yellow line as long as there are no loading restrictions. The clock on the badge must be set to show your time of arrival.
• park - free of charge and without time limit - at any on-street
pay and display parking bay or designated on-street accessible bay. You must display your Blue Badge (and the blue parking clock if the bay is time limited)
See where disabled parking bays are in Manchester.
• park on resident parking permit bays without a time limit.
The badge can only be used where the holder is a passenger to or from the parking location.