This assumes that you have Mercurial installed. If not, see Mercurial with public key authentication.
Note: this also assumes Eclipse 3.0/Flex Builder. For Eclipse 3.4, see the official installation instructions.
Start up Eclipse and click Help, Software Updates, Find and Install:
Chose “Search for new features to install” then click Next:
And enter “Mercurial Eclipse” for the name, and “http://www.vectrace.com/eclipse-update/” for the URL:
After clicking “Ok” then “Next”, you should be prompted to select the features to install. Put a check beside “Mercurial Eclipse”:
Then click keep clicking “Next” until everything is finished.
The official instructions are very good here. See importing a repository into your local workspace.
The only things to note:
ssh:SomeRepo/repo/path'', where you picked SomeRepo in while you were setting up public key authentication in the last page.