Please how can I remove the .maintenance file from my remote directory because I can only see it from the browser.

It does not all me to view the site. the url is mediamall.ng

I believe your website is on a WordPress platform. The . maintenance file is created during WordPress updates and is deleted after the update but sometimes, things could go wrong tand there would be failed updates.
To delete it, simply browse your WordPress installation using Cpanel file manager and delete the . maintenance file and all would go back to normal.

Also your directory shouldn't be browseable. that's not good.

Well if you need more assistance, get in touch with Me as am hardly on NairaLand thses days.

GoodLuck

Another thing, from the screen shot you posted above, I don't even think the.problem is the . maintenance file as if it was the issue, you would see "Website Under Maintenance".
I really can't see your website files and folders. Please confirm that the necessary website files and folders are still there.