Your system is very old.....the manual for older 16s is linked in the FAQs of this forum, and jib sheet rigging is on P. 19:
https://static.hobiecat.com/digital_assets/H16_Manual.pdf?_ga=2.117286734.974138500.1589973039-1093327542.1561755906In general, you travel the jib sheet car all the way inboard for beating and all the way outboard for broad reaching. In-between it's in-between.
There are many options for upgrading the jib sheet/traveler system. In addition to those mentioned above, some are discussed here:
https://www.hobie.com/forums/viewtopic.php?f=14&t=66357. These systems/parts are compatible with all 16s up to '94/'95.....after that the traveler tracks are integrated into the crossbars.
With your current system, you don't even have the swivel cam cleats on the front crossbar, so you're basically starting from scratch, and it will be an expensive upgrade. I'd suggest you figure out what you've got and get some time sailing it before spending any coin on new stuff. You may find that you have other, higher priorities.
Hope this helps....