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What kind of formatting needs to be done?

https://steemit.com/steemstem/@steemstem/steemstem-writing-competition-2-sharing-knowledge-on-steemit

It really just needs a paragraph explaining why you wrote about this topic (to fit in with the parameters of the contest).

and the #steemstem-competition2 tag

Do not hesitate to add this paragraph an enter the competition. There is still some time left :)

But my article is of nearly 450 words, which is not qualified word limit.

Ahah true. I missed this one ;)

I know. My article won't be qualified for the competition.