He probably meant how to switch to TDM.

Hi,

To do this, follow the instructions on this page:
https://wiki.debian.org/LightDM

But, try tdm-trinity or tdm as a name, instead of lightdm.

I personnaly don't use TDM, because it has been plain unreliable for me on R14 nightly builds, but if it does the job for you, then use it!

To get TDE to run better on the Raspberry Pi, I recommend you to lower the graphic memory to something like 32mb or 48mb, so that the rest of the systtem has more ram available. You can do this by typing raspi-config at the shell.

Hope it works!
-Alexandre