How i can hide some Parts or Link inside my topic for Guest..and how to hide before replay my topic

sorry i just tryd the Code [/hide] but its still showing to evry body .... can you explain to me more about [/hide] code
cos realy its not working...all what happen after i edit that hide code- the text became inside of one white box but still showing i tryd 2 difrant ways:-
1- [/hide]
and its still showing like thise:-


then the text between the code still showing but in white box as apicture not active


2- [/hide]
and its showing like thise :-

the text still showing in white box also {but active just as it was before any hide code's .so any guest still canuse my site links
i need help please....and what i can do if i need to hide the link in the topic that its showing only after you replay my topic
thanks lot of thanks to evry body