Keywords: General - Google Cloud Platform - How to - Secure Connections (SSL/HTTPS)Description: ssl certificate not appying and how can i change my wordpress theme
Do you already have valid certificate files for your domain? If so, you just need to follow this guide
Let us know if you want to use a Let's Encrypt certificate instead of one you have.
Regarding the WordPress' theme, that's something you can change in the admin panel of the application