this question is my first question. There are policies available in the site that I make, press the checkbox to accept it, eh button have to go to the next page, but I got the help I've run into even I do not know how it should be required but this is doesn't work
<label for="myCheck">I agree:</label>
<input type="checkbox" id="myCheck" required>
<a href="img.html" class="btn btn-outline-success" role="button">Let's go</a>
if I understand your question well:
The user have to check the input in order to let him go to img.html. if that´s the case you can do this:
<form action="img.html">
<input type="checkbox" id="myCheck" required> I agree policies
<button type="submit">Let's go</button>
</form>