我需要在选中复选框后启用表单（在页面加载时禁用）

I need your help here cause I am not aware of javascript or jquery library and i think i definitely have to use them in my project.I have a disabled form when the page loads and I want to enable when I checked on the check box.I tried a lot but I didn't find any solutions..I need your help here cause I am not aware of j