如何更改XAMPP i的默认请求URL。e localhost:80 / xampp

I installed XAMPP on windows 7, Apache was not running because Port 80 was not released. I changed it to 81 in “httpd” (C:\xampp\apache\conf) and now its working. Issue is that every time xampp control panel opens localhost:80/xampp and then I have to manually change it to localhost:81/xampp. Please guide me, where I have to make changing to make default Requested URL localhost:81/xampp ? I’m a beginner ok and didn't get help by random searching. ThanksI installed XAMPP on windows 7, Apache was not