Emirikol said:
Is it a minor or standard action to "mark" someone?
jh
Depends on the ability, but most of them are done as part of an attack.
Here is the blurb about marked as a condition from the pre-release rules compendium
"MARKED: (From Premade Character Sheets and Save My Game
Article)
A particular creature has marked you.
You can only be marked by 1 creature at a time. If another creature
marks you, you lose the old mark and gain the new one.
You are at -2 on all attacks that do not include the creature that marked
you as a target.
You may suffer other penalties for attacking a creature other than the
one that marked you, if that creature has such an ability."
Any monster that can mark will say so in the statblock in the powers section.
Keep in mind the paladins mark does something completely different.Take a look at that character sheet for details.