opigno database setup

Hello, I have a backup opigno database and i want to upload it to a server and also an opigno platform backup which i have already uploaded there. However, since i am new to databases and servers, i do not know where to upload my database and how to make the existing platform have a new password (since its directory is new). I checked the manual but i only found how to create a database, not how to use an existing. Do you have anything to suggest? Thank you