I have uploaded the calendar to the hosting file manager. and edited the webpage HTML and place the Code in for the web page to open the calendar but the whole web page is blank.

any ideas

Did you upload all the files belonging to the calendar? By default, they are sitting in a folder called My calendar (by default). You need to upload the contents of that folder, not the folder itself.

Or, are you viewing the site with a device that has no flash? The calendar if flash based, so it won't work on tablets or phones.

If none of the above applies, let us see the page, so that we can make more qualified guesses.