Another easy one to figure out, the car won’t start but the instrument cluster might still operate. Pop the bonnet and find the battery, it may be under a plastic shield of some description. If you don’t have access to a new battery or tools to remove it, get a pair of jump leads.
If you have spanners/sockets and a new battery, then simply remove the negative-then-positive terminals, and switch it out for the new battery. Top tip: use terminal covers to prevent corrosion from the weather (especially winter) and never leave the car stood for long periods without driving it.
Don’t let this one fool you, although it’s electronics, a bulb change is just a bulb change. Get past any annoying trims or housings, and it’s as easy as taking the old bulb out, asking the motor factors/store for a replacement of this type, and then popping it in (with the car turned off of course).
Legal requirements mean this has to be done, so don’t leave it until later!