I think your on
VH25 server
If so! go to the link & put in your user name & password & enter.
When your in this area, click on file manager & then click on the public_html folder (Not the text). You will now see all your pages, images & any files. Click on one that you want to delete & on the top right hand side of the page will give you some commands. Choose delete.
Its a lot quicker to do this via FTP, BUT! you don't get a second chance as there is not waste bin with this choice.
Ah! need some speed typing lessons. lol