Sorry to sound ignorant, but when this decentralized exchange thing is done a coin's website can link to what to enable people to buy?

A person goes to http://slimco.in/ or http://www.slimcoin.club/ or wherever and there is a page called "Buy Decentrally".

Where does that page lead?

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Also, fwiw, my review of Nova exchange. Early on an exchange opened called Nova Exchange. There were obvious problems, they were clearly not suited as an exchange, then they announced they had been hacked and were shutting. Some time later this Nova exchange opened, not sure if the two are the same. At this Nova once I saw an impressive opportunity in one of the order books on a coin that is traded on one other exchange. Once I logged in, the order book changed. The appearance was that possibly they, or somebody, is trading based on who is logged in and what currencies they own. It may be inappropriate to make an accusation like that without proof, and I apologize for that, and it may have been a one off thing, just a coincidence, but I am cautious there. On the other hand, their interface is done extremely well. The amount of effort they put into fine tuning all aspects of the site itself is impressive. If I am mistaken about the first point then their excellent work on the interface by itself is enough to make them a better exchange.