Where is the Block list?

Is there a block/ignore feature? I have this fan/stalker who likes to send me obscene messages whenever I log in. What do I do? I just want it to stop.
http://onigiri.cyberstep.com/_/forum/
http://onigiri.cyberstep.com/_/forum/viewtopic.php?f=15&t=3898
Karasuki wrote:You did many nice things for me and I didnt want to make it look like i didnt care about you![]()
I just wanted to be friends
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Karasuki wrote:Im just saying, if someone thinks im bothering them, let me know so i would stop. I didnt know i was really bothering him i thought he was AFK all the time. And all i was doing was asking questions and help