Backup problem

I am new to WordPress. The site I am managing is hosted at WordPress.com. I am getting a couple of messages on my dashboard as follows. (For security I have replaced the file names with FOLDERNAME, MYWEBSITE, NEWLOCATION):

Your backup folder is NOT writable
To correct this issue, make the folder /home3/FOLDERNAME/public_html/wp-content/backup-db writable.

Your backup folder MIGHT be visible to the public
To correct this issue, move the file from /home1/tutorti2/public_html/MYWEBSITE/wp-content/plugins/wp-dbmanager/htaccess.txt to /home3/NEWLOCATION/public_html/wp-content/backup-db/.htaccess

Please help. I do not know how to access the folders or files without using FTP and since the .com hosted sites cannot be managed with FTP I am clueless about how to do these fixes.

Thanks in advance!