Here you can view the frequent asked questions for Player Auctions, it might answer your question!

1. Why cant my players sell any items?

You will need a permissions plugin, and give them the permission pa.limit.<auctions>. For example: pa.limit.1 - can sell one item.

2. Why can't I add empty lines to item descriptions?

There is a feature disabled by default there empty lines will automatically be removed in the description, you can disable this in the config.yml