Originally Posted by Tom_Slick

Try closing and restating the program. Then go to "2. Installing the Plugins
Next you must install the Flash plugins for TCPMP. Make sure you install the plugin in the same place as the player (Device or Storage Card).
TCPMP FLV Plugin (PDA & Smartphone)

3. Setting the proper Protocols
Whew, the hard part is now over, lets get to the setting up! First open TCPMP and press 'Options -> Settings'. From the screen that brings you to press 'Select Page -> File Associations'. On the bottom of this page you will see both 'Flash Video' and 'MMS Protocol', make sure both of them are checked. If you don't see both of these settings, you may need a soft reset. Once they are both checked, keep the settings open and move onto step 4.

4. Setting the Buffering
The buffering could make or break your YouTube Pocket experiance, so let's make sure you set it properly. While still in the settings page click 'Select Page -> Buffering'. here you will see some buffering options, you want them to be as listed below:

Normal buffer size: 1148KB
Preload at underrun: 5%
Preload for audio: 64KB "