said 10 months ago:
@evelyneoreskovich In Appearance > Themes You will see all the themes installed in your WP install.
Here you can click on “Live Preview” to see what the theme looks like with your content. In some cases you can even customize the theme, than save and publish it, but I do believe the theme has to be able to do that. The standard WP themes for instance have that ability.Under the tab Install Themes you’ll find the bottomless pit of available themes…And yes, you just ‘Activate’ it and yes, after activation everybody sees it, but only after activation, not during preview.