Some phones are locked to prevent you from installing applications. It's easy to fix this by changing the default setting. The following screenshots will lead you through changing these settings.

From the main menu select "Tools"

Then select "App mgr" aka the "Application Manager".

Then select "Options" to bring up the menu.

Select the "Settings" item on the menu and press "Select".

If as shown above the "Software installation" setting says "Signed only" then you need to change this to "All". To do this press the fire button or select "Options"->"Change" using the menus. This will display the following screen.

Move down and select "All"

Then press "OK".

Finally select "Back"

Then select "Exit". That's it! The settings have been changed. Now try to install TextQuick again.