Log in to the FTP, and then go to Magento 2 root folder (generally present under the public_html folder).
Create a new folder named codeunder the appfolder; under the codefolder, create a folder named Ced.
Upload or Drag and Drop app/code/Ced/Mlibrecbt directory.
After successfully uploading the directory, the extension will be installed/upgraded.
Now run the following upgrade command in cmd: php bin/magento setup:upgrade php bin/magento setup:di:compile php bin/magento setup:static-content:deploy -f php bin/magento indexer:reindex php bin/magento cache:flush