I need to write an essay and I need advice on how to conclude it.

If you re-post your question and give us additional
information, it will be easier to answer you more specifically. In general, however,
there are a lot of theories about how to conclude an essay. A very basic plan is to
restate your thesis statement from the opening paragraph. At your level, this should be
done in a skillful way, however. If you simply restate what you have already written, it
will be simplistic. Your ending also will depend heavily on the type of essay you are
writing. If the essay is informative, for example, then you could go the "restate the
thesis" route. However, if it is humorous essay, you have more freedom to be creative.
In this case, the ending should have a strong impact - leave the reader smiling or
laughing at the end. If the essay is more philosophical in nature, it can be effective
to end with a dynamite quote that is germane to your topic. Also, some very persuasive
essays can be ended strongly with rhetorical questions.

I
could go on and on. As you see, there are so many possibilities. That is why we need
more information in order to help you.