Setting a Standard Edit Mode

[santimariani]

This might not be a very smart question, so please bear with this newbie!

My question is the following: how do I set the other editor mode as the standard one (the one that lets you see what your post will look like as you type it)? Many of the members of my forum will not be used to having to use commands, and thus it is essential that they be able to use this editor mode as the standard one (I still would like to have the option of switching between the two by clicking on the button with the two A's).

I have been trying to find the answer to this question, but, sadly, have not been able to do so. Could someone, then, also let me know what the names for these two modes are? That might help for the future. Thanks!

Santiago