First of all, you cannot use WWW at the beginning of your domain. You will need to just use https://labgudino.000webhostapp.com or point your own domain.
If you already have a domain click here.
If you don't have one but would like one free of charge click here.
As far as the Panda Security issue, this is something that only they can fix. They probably blocked the site because 000webhost is sometimes used for spam. Maybe there is a way you can add an exception, so I would suggest contacting their support.