You are talking about "overwrites" when your customization are overwritten by an update. What you need are overrides which are not overwritten by updates. For CSS changes you need to check for template to find out specifically how to make a custom.css. There you can in example put your CSS changes to prevent them from being overwritten. For additional customizations you can find a documentation for EasySocial here: https://stackideas.com/docs/easysocial/administrators/templating/template-overrides

Hey Mark,

Perhaps you can share with us how you customise those CSS or replacement images in previously? So that we can able to guide you what is the best way to put your customisation into your current template directory for prevent not override your changes in next update.

Also, when a user registers on my website they receive a verification email referencing Easysocial. How do I change the email so that it shows my company name, text and images please?

For the email logo, you can upload your custom email logo from backend > Easysocial > setting > layout > general > logo , regarding the verification email content, you can modify it from backend > Easysocial > email > template editor > edit 'verify.php' .

When you see these kind of language constant e.g COM_EASYSOCIAL_EMAILS_REGISTRATION_SUBHEADING , you can override this from backend > extension > language > override section.

You can refer on this documentation : https://stackideas.com/docs/easysocial/administrators/languages/creating-language-overrides

By the way, thanks for sharing Sabih