Must you belittle every new user because they happen to have overlooked the search engine? This seems to be getting habit-forming, if you have nothing constructive to say then spare us your mentality.
NMILFORD: As TheRat mentioned, this has been brought up before, though in the meantime mIRC does have two options for the positioning of buttons - they being in order of when windows are opened and in order of window type, where Status is first then channels then privates then the other miscellaneous windows such as channel list, URL list, etc.
In addition, for your information, the mIRC forums do have a search engine, where you can backtrack to previous discussions that may have occurred. One mistake that TheRat made though is that not all forums have this feature. I am a member of about 20 forums and about 6, including this one has a search engine.