How to determine possible SQL injection vulnerability?

I ran the OWASP SQL injection scanner tool on a website’s sign-in page I formerly operated and two vulnerable parameters displayed. The first parameter was “returnURL” and the second one was “isLogin” showing POST DATA: IsLogin=true AND 1=1 —

What does this mean and how do I exploit this for testing purposes and ultimately fix the potential error? Should I use a Kali tool such as MySQL or do you have other suggestions?

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Author: thenewcoder