I tried to add the external magento-2 extension but I can\'t add it because I can\'t find magento-connect in admin side. I think the admin panel doesn\'t have magento-connec
Firstly download the extension you want to install. Then unzip it. Open Filezilla and copy or upload app folder to your Magento 2 public_html folder. Once files are uploaded. Run the following SSH commands using Putty.
You can then go in to the Magento 2 backend and Refresh Cache. That is how to add or install an extension.