It is helpful to look at your opening and closing paragraphs to determine if they “frame” your paper effectively and appropriately. Looking at them side by side gives you a different perspective. You can, for example, see if the paper has addressed the issues raised in the introduction–and if the conclusion finalizes your thoughts on those issues.
In the discussion, post your introduction and your conclusion.
Address what you have in the introduction and for your thesis to demonstrate how the conclusion resolves, answers, or supports the idea of the conclusion.