Still not read that tutorial.... I guess it's about 3 yrs old, if not older by now.
So that tutorial would be using MonoDevelop 1.x, somethings have changed in MD2+ so just create your solution, once the code opens in the editor, follow the instruction to change the runtime.
If I have time tonight I'll dig out the mag & have a look at this tutorial.
Just had a quick look at the archives (only have 98 onwards on my book shelf)
Basically create your project first then alter the run time version.
lubuntu LXDE 13.10 running on AMD Phenom II*4; ASUS Crosshair III Formula MB; 4 GB Ram.....