How to start website???

[helpme]

I'm an end user of your product. I bought a host using plesk desk 7.0, after configuring write access for upload pic but It's don't work. I press "stopwebsite" button and now all the website are die.(because I want to restart website like I do it on localhost but .....). I can only access FPT to upload file. Please help me how to start website again. Please, I need it urgently.