Blank webpage, no admin login

I am a WordPress novice. I installed wordpress yesterday using MAMP and a theme from Theme Trust. The website I’m trying to build is called kayandy.com. It appeared to go smoothly and I got the standard “Hello World” wordpress starter page. I made no changes. Then, today I tried to log into my admin dashboard but both the page kayandy.com and my admin login page appear as white, blank pages. I read that this is likely a PHP error, although I don’t really know how to troubleshoot that. How can I get this to work? I don’t mind starting over completely because I haven’t posted anything yet, but I when I try to reinstall wordpress it also doesn’t work.