How can i change accounts in black desert online once i have already logged in another acc

[IPIBM nabi2k]

Hello i played the free trial for 7 days so i decided to buy the game but while i was registering i just didnt see a button which says "if u have already an account press here".Now i dont know how to change accounts can you help me please?

[npc with feelings]

"Can I move my game account from Black Desert Online to Steam?
No. All Steam players will need to create a new Black Desert Online account. Pre-existing accounts will not be able to migrate or sync their accounts with a Steam account."