There are many brands of electric dryers out there, but fortunately their construction follows just a few basic designs. The one I'm describing is a 20 year old Canadian Eaton model, but some of the inexpensive models sold today have the same construction.

A good indicator that you are dealing with a similar model is the presence of three screws at the end of the drum, which you can see after opening the appliance door. In these appliances the drum is held in place by the axis connected by the three screws you can see in the picture and the friction pads at the front panel of the dryer.

The first thing you will want to do is reach behind the dryer and unplug it from the electric outlet.