I think the Manual for TASEditor should be a bit more trivial & visual
for example:
Load existing movie into TASEditor, by engaging TASEditor while the movie you need is loaded into emulator
Doubleclick on frame number & the movie will be brought to this frame
Click '||' to play movie from the current frame
'<' and '>' advance movie 1 frame back or forward respectively
You also may advance frames your usual way
'<<' and '>>' bring movie to begining or end
Add input by doubleclicking the place you need, accordingly to frame number & button, or you may highlight the frame & click on the button name in the headline
EDIT: i lol'd hardly after realising that Tas Editor gives 0 rerecord count to movie XD
also noticed that it actually can NOT paste frames, only cut. it is drawback...
Add link to TASEdit page in 1st post
http://tasvideos.org/EmulatorResources/TASEdit.html