Tried help section, searched throughout this forum, read sticky about bugs, but there is nothing about my problems. Images with blacklisted tags still appear when I'm browsing.
There isn't any +/- characters in tag list, like on gelbooru, but they're mentioned in help section.
Excuse me, if this kind questions asked to frequently, and I'm being a noob, but please help.

asked frequently, yes it is. separate each tag with a new line. forum #4816

check out the wiki page for blacklist too