Instead of using the 000webhost file manager which you need to login to on 000webhost you can upload this script which enables you to login directly on your site i.e. yoursite.000webhostapp.com/manager etc and you can create users so you can have workmates/friends connect to your site and manage files too!
Download the script here: http://extplorer.net/attachments/download/68/eXtplorer_2.1.9.zip
Once downloaded the installation is too simple!
Just upload the zip file to your hosting!
Once uploaded I will use unzipper.php to unzip it
Easy as that it installed! Visit your site now /manage if that is the directory you installed it in
Tada! You can fully manage your 000webhost files within logging into 000webhost.com
Fully edit files and make changes to your code