In the receiver section E-430, you find the main power switch and the volume control in the middle below the signal strength meter.
The speaker grille is located at the left, the switch for the internal speaker, the headphones jack and the antenna BNC socket left of the speaker.
At the right, you find a red LED memory channel and frequency display and a display for the internal test results in the top row, below the numbered keys of the direct frequency entry keypad ant at the right the modes switch: A1 stands for morse code tranmissions, A3JO and A3JU for upper lower sideband SSB reception, F1 and F4 are frequency shift radioteletype and data transmission modes.

In the transmitter control section BG-430, you find agin in the middle the power switch, at the left the jacks for the TC-535 (radioteletype encrypter) or the FSA-430 (connector box to teletypewriter), the morse key or microtel (microphone / telephone handset) and the SVZ-430 (speech encryptor) and below the connectors for the two wire line to the transmitter and another two connectors for the service telephone (DTf).

In the bottom row, you find the power supply BN-430 at the left with the mains cable, the fuse and the main power switch, next to it the controls of the accumulator charger with a meter displaying the accumulator voltage and a test pushbutton and accumulator charging lamp and at the right the 24V / 4 Ah accumulator in a drawer.

To operate the set, first connect to 220 V mains, connect a improvised antenna to the BNC jack of the E-430 and turn the set on with the main power switch of the BN-430, the green 220V and CHARGER lights should be lit.
Then proceed either with switching on the transmitter control BG-430, you should see the number 287 flashing in the TEST display, which will indicate that the receiver is not yet turned on.
Or you directly switch on the receiver E-430, TEST 187 will indicate that the transmitter is switched off or not active.

Make sure that the internal speaker is activated, set the volume control to a medium setting, select the reception mode and enter a frequency. Press CL and key in the desired frequency; use the command S followed by a digit 0 - 9 to store the frequency in one of the ten memory channels of the E-430. Pressing the button K followed by the channel number will recall the frequency from the respective memory channel. FS will recall the frequency the transmitter is tuned to to the receivers frequency memory. Use the combination K followed by three times CL for an emergency erase of all frequency memory contents, the receiver will be locked unteil you turn it off an on again.
You can also use the + or - keys to tune the set up or down. For this press +, the frequency step and + another time, every time You press + again, the receiver will be tuned up the same amount.
A flashing frequency display will indicate that the receiver is tuned to the desired frequency and reception is possible, the transmitter is not yet tuned. After you have activated automatic tuning of the transmitter connected to the BG-430, the frequency display will be steady.

As you are not allowed to operate the transmitter unless you are an authorized holder of a (amateur radio) licence, I will not dive into details about how to operate the transmitter section.