To use the Hip Attachment, you need to already own the Flowpression Boots Pro+, as the Hip Attachment is an accessory and does not come with its own pump.
The Hip Attachment, just like the boots, has two hose connectors that are easily attached to the same pump. Connect the hoses in the same way as you do with the boots, select “Hip” in the pump menu, and start the program. After that, you’re ready to begin your session!