A point of order is used when the chair has made a procedural mistake. Taking the order of debate in the wrong sequence is one example. Getting the debate time wrong is another.
It does not interrupt a speaker.
It is not debatable. The chair rules on it, and the ruling stands.
A point of order refers to the mistake the house has only now seen. It is not a way to reopen a decision from earlier in the day. A delegate who raises a point of order about something from an hour ago is out of order.
Wait to be recognised. Name the point, then say what the mistake was in one sentence.
Say what happened, not what you think of it. A point of order is about procedure. It is not about whether a resolution or an amendment is any good.
The chair repeats the point back to the house, then explains the ruling clearly so the whole house understands it.
If the delegate is right, say so. Say "the chair stands corrected", fix the mistake, and move on. Do not argue about it. A chair who admits a mistake in one sentence loses nothing.
If the delegate is wrong, explain why, in terms the whole house can follow.
A chair never says whether the thing being debated or voted on is good or bad. A chair who does that will draw a point of order, and deserve it.
If you are unsure. Ask the house to wait. Check with your co-chair. If you still do not know, tell the house you will find out and come back to them. Then ask the secretariat. Never rule quickly to look decisive.
If the complaint is about another delegate's language. A point of order is raised against the chair's handling of procedure, so that is the wrong point. Deal with the language, then tell the house which point that was.
All points are out of order during voting. A point of order about the conduct of the vote itself is the one exception. See Voting procedure.
That covers the running of the vote itself. A miscount is the clearest example.
If a delegate asks for a recount. A close vote may be recounted, but only if the chair believes a counting error was made. Delegates must vote the same way again.
In MEDIMUN, voting happens in MediBook, and the count comes from there. See Voting in MediBook.