I finally figured out how to transfer steem to my steemit account, actually pretty simple.
I have a Binance account so I bought steem there.
Then I found this article and it helped so much!
Thank you, @unbiasedwriter!!!
https://www.ipaddressguide.org/how-to-transfer-steem-from-binance-bittrex-to-steemit/#:~:text=How%20to%20transfer%20Steem%20from%20Binance%20to%20Steemit%3F,amount%20of%20Steem%20tokens%20you%20want%20to%20transfer.
You just use your steemit username for the wallet address and it works fine!