Theme a no-show after activation

I am working on building my new site, https://www.psychedtowrite.com, in wordpress. none of the themes i have tried to activate have worked. my website still just looks generic. The themes have been from wordpress.com, though. does that make a difference? I downloaded one from www.remarpro.com, but couldn’t find instructions from developer on how to install it. any help? i like the variety on wordpress.com better. www.remarpro.com has like only 10 choices. any comments/help would be appreciated. thanks!