The plugin works out of the box with the default vBulletin5 theme. With a custom theme the icons might not be displayed because the HTML structure is different and the plugin does not know where you want it to be displayed.
For this reason I have now added the new version 1.1.0. With this version you can use the following vBulletin template method :
Code:
{vb:template oneallsociallogin}
You can simply add this tag to a template, at the location where you want the Social Login icons to be displayed. You can edit the template in your Admin ACP under
Styles&Templates -> Style Manager -> Edit Templates (In the dropdown)