To add a source to Cydia installer, follow the instructions
1. Open Cydia installer App
2. Go to manage Tab in Cydia installer
3. Tap on sources
4. Tap Edit button
5. You’ll see Add Button on top
6. After tapping on Add button a popup will appear
7. Provide valid source repository path
8. Tap add source button.

Source is added to Cydia installer. All the application available in added source repository will be available in Cydia installer