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Either use the note cut command (push '1' on your keyboard), or...
Use the volume column to lower the volume at the end of the note. Then restore full volume at the start of the next note (this won't work on the triangle channel).
Here's an example of how to do it several ways.
(Attached is a .FTM file, you can open it in Famitracker)
You can use the note cut with the delay command (Gxx) to delay the note cut until right before the next note.
Or you can use the Sxx command. It specifies how many frames you want the note to last.
Or you can use volume settings, either in the volume column, or in the instrument parameters.
ha, i didn't know about the I00 method. it probably has very limited use though since in more dense arrangements you mightn't even hear it. however in classic chiptuning it might be useful. i dunno. Sxx, notestop, volume column and volume envelopes all work fine.