If they have a fanclub on 潮流粉丝俱乐部 你 can 搜索 them in the 最佳, 返回页首 right corner of the screen. If they're already your 粉丝 and you're a 粉丝 of them on 你 IM bar 你 can 搜索 them. I don't really get what 你 meant 由 searh other than that.
Well,it depends. If 你 know their real name 或者 username,type it in the 搜索 bar in the upper right hand corner.Press enter,then press advanced 搜索 and press fans,and press 搜索 again.It will bring 你 to the result,but there may be 更多 than one if it is their real name.