What is a dispute?
In general, players are encouraged to deal with disputes among themselves before searching for staff help. At the very least, you should try to discuss your grievances with the other player(s) before reporting them on the forum. A good discussion may lead to an acceptable solution for both parties, which is a lot better if handled in private. If you cannot seem to agree, post a thread on the "Report Bad Players" forum and clearly detail your issue with this player.
How to handle a dispute
Examples of good disputes
"I gave a loan to player [name], and they have not repaid in time. I warned them a couple of times now, and around this time I would like to report this." [added screenshot of the loan]
"I hired my friend to help build my shop, but he changed the item prices and won't reply." [added screenshot of agreement and new/old prices]
"This random guy started building in my town without my permission. I tried talking to him, but he won't reply." [added screenshot of his house]
Examples of bad disputes
"Player [name] doesn't give back my loan. Ban him, at once!" (See above)
"Someone destroyed my house after I was gone for 2 months! I want it back! Now!" (See Technical Rules)
"I DEMAND that an admin restore this. Otherwise I DEMAND I get my donation back, and I will... [long rant] to you... [swears]" (Obvious, isn't it?)