Can't upload images using Joomla! 1.5* Media Manager * Warning: Failed to move file! * Error. Unable to upload file.

where am i suppose to write & run this command..

You need to have shell access in order to run that command. If you do not have
shell access please ask your host to give you the permissions.

There is another method if you are using CPANEL?

I've already tried changing the permissions. I've got other installations on the
same server that work without issue, but then I have two installations that
refuse to.

Can't update config: "An Error has occurred! Unable to open
configuration.php file to write!"

Can't install extensions: "JFolder::create: Could not create directory
Warning! Failed to move file."

Can't update with the media manager: "Warning: Failed to move file!
Error. Unable to upload file."

For this issue "JFolder::create: Could not create directory
Warning! Failed to move file." visit www.techportal.co.za/joomla/joomla-tutorials/82...

Did you try changing the permissions for configuration.php to 777? And change
the permissions for the image folder to 777 recursively?

If you have tried, the ownership could be wrong, then try something like this