Evaporator drain clogged where is it located and how do I clear it?

I have the car listed above that has water pooling in the passenger side foot well. I've recently replaced the blower motor to get my A/C to work, but now I think the evaporator line/drain is clogged.
I cannot locate where the drain is located to try and clear it and there's no one online that has a clear image and location of the drain.
Any help is appreciated!