I have just succeeded in all this, yes I was finally able to connect with the owner account and I was able to download the PDF file with the private keys for the profile as well. (I did not know that there was also the added profile).
And, after that I was able to go to role and add my main account, this one. I was able to do it with hive.blog because with Ecency I couldn't get this famous community master key opening. I don't know why, but now I can manage with this account on Ecency.