Sounds like you unnecessarily erased the dreampi image on the SD card and then failed to burn a new image to the SD card. Were you sure to extract the .img file out of the zip file and the select that .img image when using BalenaEtcher to burn dreampi to the SD card? You shouldn't be directly copying the zip file over if that is potentially what you have done?
The instructions should be followed very similarly to this, except for using BalenaEtcher instead to copy the img over to the SD Card of course
https://www.youtube.com/watch?v=VgRLnj2YR3sI hate to say it, but feel I need to address the elephant in the room and advise that if you are struggling this much so far, then getting online might not be the best avenue for you to be taking at this point in time.