Follow these steps to disconnect PosterMyWall from your Google account:
- Login to the Google account that you want to disconnect.
- Go to the Data and Privacy tab on your Google account.
- Scroll down and under 'Data from apps and services you use' go to 'Third-party apps & services'
- Look for PosterMyWall in the list of apps.
- Select the PosterMyWall app and click the 'Delete all connections you have with PosterMyWall' button. It's the last option.