The MIF Reference Manual in the OnlineManuals folder is your friend here, under the FM install directory, for FM 7 and earlier; in the Documents folder for FM 8.
Often it's helpful to save a small sample of FM content as MIF and open it in a text editor (or in FM by holding Shift while you click Open, to force it to open as text) and observing the MIF coding. Don't be dismayed by the hundreds of pages in the beginning of the document. Go the the end and look for your conditionalized "Hello, you colorfulcolourful world!" test passage.
NOTE: To save MIF code that you're viewing or creating in FM, save it as TEXT; this is like saving from a text editor.
HTH
Regards,
Peter Gold
KnowHow ProServices