To find it, you'll likely need to:
1. Consult your owner's manual: This is the best first step. The manual should have a diagram showing the location of relays and fuses.
2. Check the under-hood fuse box: While the relay itself might not be *in* the fuse box, it's often located nearby, sometimes attached to the fuse box or on a panel close by.
3. Look under the dash: Many automotive relays are mounted under the dashboard, often near the steering column. This is a less convenient location, but possible.
4. Check wiring diagrams: A wiring diagram specific to your 1994 Camaro (available online from various automotive parts websites or repair manuals) will show the path of the horn circuit and help locate the relay. This is probably the most reliable method, but requires some electrical knowledge to interpret the diagram.
Because of the variability in location, a specific answer isn't possible without referring to your car's specific documentation. Start with your owner's manual.