[Oh Haha]

The top slider on the dash panel is supposed to control the speed of the blower in trunk, directly under the dash.

You should have a blower on the left side of the engine compartment as well which helps push the heat from the heat exchangers up to the front.

Do you get heat and "pressure" from the other vents?

Check your fuses first and then look over the blowers to see that they are not frozen. A few drops of oil will sometimes get them going again.