I assume this is a 67 Olds? Start by checking all the fuses in the fuse box that have power with th key in “run” such as turn signals, backup lamps, etc. if none of those work, check for power at the pink wire at the back of the ignition switch. if you have no power there, you won’t have any at the fuse box.

Before you get to involved, does anything electrical work? Do you have dome lights, does the radio work? Wipers, will it crank? See if you have power at any of the fuses. I don’t have a wiring diagram for a Olds of that year, so I’m not sure what fusible links protect what circuits. If nothing works, disregard my previous suggestions. A little more info is needed.

Ok, I’m familiar with the 69 cars. There are 2 fusible links at the horn relay on the inner fender. If all the ignition on fuses in the fuse box are dead, most likely you have a visible link blown or a ignition switch issue. Drop the column, with the key on you should have power at the pink wire, and the heavy brown. The brown wire is the power feed to things that will operate in the accessory position with the ignition, the pink is the power feed to things that only operate in the “run” position (coil, power windows, turn signal, etc). Do you have a service manual? It will detail the wiring far better than I can here.