Having trouble replacing timimg belt. Need help to properly adjust and install

Try this on 'youtube' and see if it looks like your 2.3- in the search bar type exactly "1991 isuzu amigo 2.3 timing belt replacement" The first 2 results are ads , the 3rd , if you get the same results as mine is a video by "Johnny5ive" , maybe that will help. Or pick up a cheap chilton or haynes manual at Advance or Autozone. Much easier than trying to explain timing marks on-line , plus , if not explained or understood correctly , you're back to square one with bent valves. Hope this helped , good luck.