How can I check my transmission fluid on a 2005.

It is sealed yes, but with Allen and torx bolts. You'll need to jack up the car and keep it level and then look for the black plastic tray near the middle front of the car. The fill hole where you check transmission level is on the passenger side near the rear slightly above the plastic pan.

If you do fill with fluid, you'll need to run the car through the gears and then check the fluid again, as about a quart gets put into the gears when you cycle through them (keep the brake on and lower the car on the ground for safety if you are using jacks or jack stands).