In the Livicom app, open the «Home» screen of the Site.
In the upper right corner of the screen tap on the «gear».
Find the user, which you want to delete, in the list («Family» section) and tap on the plate with the name of user.
Tap on three dots («Menu» button) in the upper right corner of the user profile screen.
Select «Delete» in the menu.
Access to your site for this user will be denied. The user profile will be removed from the site's user list, and your site will be removed from the user's site list.