The answer to 'how to unclog toilet repair' is to first try plunging the toilet. Use a plunger to create suction and push/pull the clog down the drain. If that doesn't work, you can try using a toilet auger or 'closet snake' to physically break up the clog. Start by inserting the auger into the toilet and turning the handle to extend the cable down the drain. Keep turning until you feel the clog break free.
If the clog persists after plunging and using an auger, you may need to disassemble the toilet to access the drain pipe directly. This is more advanced and you may want to call a professional plumber, especially if you're not comfortable working with plumbing. A plumber has the right tools and experience to safely and effectively clear a stubborn toilet clog.