Before you ask, know that at this rate an update to Android 2.3 Gingerbread will probably never officially make it to your device. I don’t see Motorola supporting this smartphone with updates until December (when one year from Gingerbread’s announcement will have passed).
So enjoy what you can, while you can. The Froyo update brings neat things like a faster browser, the ability to install apps on the SD card… you know, things that owners of other brands of Android smartphones have been enjoying for the better part of a year.
So, to get this update, you need to go to Motorola’s special download page here. Make sure you select “MOTODEFY T-Mobile UK” as your phone model. The updating procedure requires the use of a computer. It’s all detailed on this page. For full information about what’s included in the update, read this PDF.