So someone on reddit sent me bitcoin via chaintip and I dont know how to receive it as I'm new

BitcoinBitcoin
$23,956.96
‑0.04%
self.Bitcoin5d ago
I just downloaded an app and got a wallet and i copied pasted the btc address and sent it to him but it keeps saying that my address code has not yet linked an address Help,and some words used in the description may be wrong (I'm not sure as I'm new)feel free to correct me or give me advice on this