To uninstall a theme from concrete5studio.com, start by logging into your sites dashboard, and go to the Pages and Themes page.
Then click the 'Remove' button next to the theme that you want to delete. And that is all you need to do.
If you want to Reinstall the theme you can go to the “Add Functionality” page, and click the 'Install' button next to the theme, under the 'Downloaded and Ready to Install' section.
If you installed a package that contains several themes or colors, you can easily remove all of them at once. To do this simply go to the 'Add Functionality' page and click on the 'Edit' button next to the package you want to remove. In this example, we will remove the 'Lighten Up' theme, which includes three colors.
Next click on the 'Uninstall Package' button, and then click 'OK' when it asks you if you want to remove all element associated with the package.
Note that the package returns to the 'Downloaded and Ready to Install' section. You can reinstall it from here, or if you want to remove it completely, you need to delete it from your server, under the 'packages' directory in your concrete5 directory.