PKing
Are you a PKer? Got a great kill? Or just want to discuss PKing, here's your spot.
You don't start a sentence off with 'Or'. It should be: "Are you a PKer? Got a great kill, or just want to discuss PKing? Here's your spot.
Show Off / Achievements
Did you achieve something? Hacked a account or made your first 5 million? Post it here!
'A account' should be 'an', since the word following it starts with a vowel.
Skills
Discuss all RuneScape skills here, whether it may be techniques or just general, here's your spot.
There is no need for 'may' in the sentence. 'whether it be techniques or just general discussion, here's your spot.' should be the sentence.
Blah blah blah, Grammar Nazi, blah blah blah.