stupid question maybe but need some help.

BitcoinBitcoin
$19,498.75
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7D Ago
self.Bitcoin
So I have some bitcoin under $50 but its in this app from Google play named Bitcoin.com. I received the bitcoin like 3 years ago for some work I did and didn't really care but now I have realized that I should maybe move it into a exchange wallet so I can sell it or whatever. I don't know how to to that now. Do I send what I already have in the new exchange wallet or is there a way to connect both wallets? English is not my first language so if there is something wrong with explaining my problem please let me know.