All this kind of information, including step-by-step instructions, FAQ's, etc. can be found on the
Official Messenger Plus! Help Pages or
Messenger Plus! Tutorials.
It is highly recommended to read those first before using Messenger Plus! for the first time. Almost everything you need to know to get you started is listed there.
If you have further questions,
search the forums, as many same questions have been ask and answered already.
If you still can't find the answer, don't hesitate do post your question...
/ 
