You can add pitch bends in the "Piano Roll" editor. Make sure to have the midi track on either the melody or soloist channel there. Once you have added the bends, be sure to hi-lite a note, then "select all" and re-channel the data and notes to either 4 for melody or 8 for soloist.

That way, your hard work will not be overwritten when you press the play button.

You can draw in the pitch bends manually via the pencil there. Usually, the bend will go from the center line up to the top, then across for a few ticks and back down to the center line. Looks sort of like a bridge when done correctly. If you leave the "down" line above or below the center line, the note will be sharp (above) or flat (below). You have to have a note present in order to do a bend.

Trial and error.

Try and find a midi with guitar bends as an example, before you edit your song. And don't forget to save your midi prior to making ANY edits. You don't want to overwrite a good part.

Trax