I will be uploading a set of forum rules soon

i have composed a set of forum rules to deal with spam posts,accounts and type of contents to provide a guideline as how to post in this forum.
I'll be uploading them soon.

sure..
YOu can do one thing post them in every forum with title "Posting Guidelines"
and stick them.

sure...actually i want the link of the rules to be at the top of the forum.

that's called sticky post.
You can stick posts.

no sticky posts remain at the top of the sub forum where it is posted.But i want the link to be shown separately at the top as in DP.

yes you can either post them at every sub forum or I can add a link

No, bro all sticky posts remain at the top of that forum(or sub-forum)