Your alternator is dying

change the blinker fluid

also "the blub has blown" ??????????????????????????????????? BULB!? I don't know about hiluxes but all my cars have had many many bulbs lighting up my dash and for all of them to blow at once suggests a fault somewhere. I'd check that out before changing them.

To change them it's usually similar on all cars. Remove a bunch of screws holding the shroud on, sometimes a facia panel too. Remove a bunch of screws holding the instrument cluster in, pull it out slightly, reach behind it & disconnect all the plugs (and speedo cable if it's a cable driven speedo).

When putting the new bulbs in I try not to touch the glass with my bare fingers, though I don't know if it really matters for those 5 - 10w ones you put in dashboards but better to be safe than have to pull my dash apart again.

Also don't be tempted by those fancy LED dash lights, they're shit. I've tried a few different ones and they're all useless. Standard bulbs > LED's.

Your alternator is dying.