How can I make a jumper to get the obd-1 codes from my jeep grand cherokee laredo 5.2?
I found the obd plug after looking for about an hour but I don't have a code reader and I have heard that I can make a jumper and watch the check engine light flash and count it to get the codes.

Try a paper clip, as explained in the link below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-6.html#post832012

Ok, but which terminals?

Check with a Haynes Manual.

Thanks

Terminal's A and B.
Here's the OBD-I connector view:

34821

Insert jumper and cycle key to the RUN position. Count the Check Engine Light pulses and write down the sequence.
If you let us know what diagnostic trouble code (DTC) is stored, as well as what your symptoms are, we will be able to assist in diagnosis and make recommendations.