Binance DEX // Can't log in cause Binance changed some stuff?

Hello, where should i go to ask binance for my binance dex trading login? :/

A year ago you could sign into binance and go to the dex and start trading, you just had to send bnb there and you could start.

Now a year and half later i would love to log into my Binance DEX adress but it asks me to unlock my wallet ( i don't have anything to unlock it because Binance just gave me this adres and i could start trading a yr ago)

Any help appreciated!