- Navigate to the
Settingstab of your repository:

- Scroll down to the
Danger Zoneand clickTransfer:

- After reading the warnings, provide the name of the repository that you want to transfer and the specific organisation that the repository is going to be transferred to and click
I understand, transfer this repository:

- Done! You ‘ll then be notified that you action will take effect in a few minutes:

For more details, you can always refer to the official documentation.
Warning: once this is done, make sure you also update any local repository references using the following command git remote set-url origin <new-origin>.