Cydia Repository, Home of Flex 3
If you'd like to download Flex 3, then you're in the right place. Tap the button below if you're on an iOS device.
Manual Instructions
You'll need to be in the Cydia app, specifically the Sources tab.
Tap the Edit button at the upper right, then tap the Add button that appears in the upper left.
Type in (not .com), then tap Add Source
All done!
That's it! Not tap on the new Delta source to see what betas there are to download