Open the forked Git repository me/foobar.
Click on Compare:
![Here is a sample image of the page](https://i.stack.imgur.com/kMCvM.png)
You will get the notification:
There isn't anything to compare.
someone:master is up to date with all commits from me:master. Try switching the base for your comparison.
Click on switching the base on this page:
![Here is an example on the page](https://i.stack.imgur.com/YQd2Y.png)
Then you get to see all the commits made to someone/foobar after the day you forked it.
Click on Create pull request:
![Here is a sample page](https://i.stack.imgur.com/EH0GQ.png)
Give the pull request a title and maybe a description and click Create pull request.
On the next page, scroll to the bottom of the page and click Merge pull request and Confirm merge.
Your Git repository me/foobar will be updated.
Edit: rebase options are shown here:
![enter image description here](https://i.stack.imgur.com/MV6DL.png)
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