Ftp password required when installing a new module in drupal?

When i try to install a new module in my drupal site , I get a screen asking me for the FTP credentials user and password , I tried to solve it following the next post https://www.drupal.org/node/1036494

Changing the chown permissions

I used the commands to change some permissions and the window is asking me for the user credentials everytime , is this some configuration related with the droplet ? or any idea ?