Is there suppose to be a Report PM button? If so it will not show on my forum.
If you are using Default theme check did u uploaded this:
/images/english/postbit_report.gif
Or in your theme look is there postbit_report.gif
There's no report PM feature in MyBB, you'd need a plugin to add that.
Do you know of a plugin for it?
Lex also made one for 1.4 (mybbcentral.com)
It may work if you change the version number within the plugin file.