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Questions about how to use the site belong in "Technical Support Forum" , which is linked as Need Help? at the upper right, and also as Writing.Com Tools/Help: Technical in the left nav menu.
That said --
The file size of a Static item with a free membership is 50KB which is kilobytes. On average, that'd be about 7K words, or fewer if formatting is used.
With 10 such Statics, you can post a 50K-word novel. For larger novels, you can post a section, get feedback, delete those, and post the next section, repeat, until you've gotten feedback on all of it.
Writing.Com is not a publishing site, but a site to get feedback on your WIPs.
To post everything at once with that much text, would take a paid membership.
For that much text, an Upgraded membership would have enough space total, but doesn't have enough Static items to post 800 individual chapters, or big enough Book items to fit it all in one Book item. It could be done with multiple chapters per Static item or multiple Book items.
To post individual chapters in their own Static items, or everything in one Book item, you'd need a Premium membership.
Hope that helps.