I'm having a problem with the toilet backing up into the shower

What do I do to fix this problem
Please asap

Thanks
Mcram

That is an unpleasant situation. Your bath fixure all come together and likely share a vent stack. Your obstruction is after the union between the toilet and the tub drain. A toilet rodder will only reach 3 ft. but give that a try if you can get your hands on one. Rodding through the tub drain can also be problematic due to the stopper mechanism. If you can safely get to the vent stack on the roof rod from there. Come back and let us know if this is possible, ortherwise we may consider pulling the toilet or rodding via the sink lateral.