Clogged fridge drain tube. I think the drain tube on my GE model GTS201 fridge is clogged as there

Question

I think the drain tube on my GE model GTS201 fridge is clogged as there is often water under bottom drawers and on floor in front of fridge. Also ice on bottom of freezer compartment. Do not know where drain tube is or how to unclog it. any sugestings. Thanks