You also might want to try the default theme to make a post in, just to see how it looks. Then you can switch themes, and see if you like how things look with the new theme. If you dont like it, switch back.
It can be very frustrating choosing a theme. There are so many out there, and a lot of them dont work that well, or are coded poorly, and therefore are missing functionality.
You can uninstall a theme, although there isnt much of a need to. To uninstall the theme you will need to ftp to your site, then go into the wp-content/themes directory, and delete the folder of the theme you don't want anymore. This is also where you would install a theme manually. You would just drop your new theme into that directory, and then you should see it in the wordpress dashboard under themes.
You will find some themes and plugins do not show up in the wordpress themes search area, but are availle on the interenet elsewhere. In this case, you would have to do a manual install.
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