1990 is older than the Rempco website lists. Store : Remco
You'll have to look in an owner's manual to see if it's towable 4 down. Special equipment you'll need is a base plate, which is bolted to the front frame under or behind the bumper that allows a tow bar to hook up. They run $300 - $500 to purchase, then more if you have to have it installed. The tow bar costs $400 or more. Your Accord weighs over 2,700 lbs, you should have an auxiliary braking system to keep braking distances down and provide a way to apply brakes if it 'breaks away.' According to what state you live in or travel, it might be required, of course Laws of Physics are in effect in all places, I wouldn't tow a car or trailer without auxiliary brakes. How to hook up the tail lights, turn signals and brake lights also must be considered, some use magnetic lights on the trunk, others use specific wiring harnesses or add separate bulbs and sockets behind the tail lenses. In addition, you'll need safety chains or cables, trailer connections on front of car, wiring umbilical, etc. Buying new you are looking at almost $2,000 or more to equip a car for towing. Used items can be found on eBay, Craig's List, or other sources. You'll have to decide if a 24 year old car is worth investing all the parts and labor to make a good toad.