It's got a socket on it just like the ones on PPGA Celeron motherboards, and on its edge is a Slot 1 connector. Plug your Celeron into it and presto, it'll work with any ordinary Slot 1 motherboard. As far as the motherboard's concerned, it's looking at a plain Slot 1 processor, so your PPGA Celeron can be plugged into a motherboard that supports manual adjustment of Front Side Bus speed and processor voltage and overclocked, just like a regular Slot 1 Celeron. Some Slot 1 adaptor boards have cheap tin-plated contacts on the edge connector, which can corrode when in contact with the gold contacts in the Slot 1 edge connector. Whether this corrosion is actually likely to cause any real problems over the life of the CPU is debatable, but it was nice to note that this adaptor board had gold contacts.
Installation is trivially simple.
Then it's just a matter of clipping the rather ferociously sprung heatsink into place. Do this on a somewhat padded surface, like a newspaper, if only because the card is likely to dent whatever it's sitting on as you bear down to seat the clip properly. Fortunately, it's actually rather difficult to seat the heatsink incorrectly, so you'll likely never have to take it off. The stock Intel PPGA Celeron heatsink isn't as expansive as the stock Slot 1 unit, but it's deeper and probably has quite similar fin area. The stock Slot 1 Celeron cooling gear serves well even on many overclocked machines, and there's no reason to suppose the PPGA version will be any worse.