I know one person here who are spamming in every thread, and trolling users with stupid answers and questions. Making new Post with stupid non-crypta themes or posting pictures. Some times all page is full of only her posts! And what we can do with such users? nothing

Use the report to moderator feature, lower right corner of the post

Yes I know about this features, I do it only when it is critical. But what it will change? What kind of punishment they will receive?
Well for one, their post will be deleted(if it breaks any of the rules) and if they continue doing it, either a (3-60 days) temporary ban will be given or they will be nuked(all of their posts deleted+permaban) or they will be permabanned