Ok, with that additional information, please try the following:
I highly recommend you make a backup of your site before making these changes
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Open the online file manager (You can modify the file offline and rehollad if you wish as well)
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Locate your wp-config.php file
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At the END of the file, paste the following code:
define('WP_TEMP_DIR', dirname(__FILE__) .'/wp-content/temp/');
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Save and close the file, then open the “wp-content” folder
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Create a new folder (Inside the “wp-content” folder) and call it “temp” (Capitalization, or lack there of, matters!)
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Take another backup of your site if it works correctly
Backup instructions: