So first (and in this case because its being sold in MEME token) u need to first buy MEME. This can be done (using HIVE to buy) on hive-engine.com or if have other tokens u wish to trade/swap for MEME check those are available at beeswap.dcity.io(exemple for the pair PHOTO:MEME https://beeswap.dcity.io/swap?add_liquidity&pool=PHOTO:MEME).
Then when u get the required MEME, u can buy it at the link I mentioned on the post.
Let me know more questions. Happy to help.