Hover over a file and click More then Edit
The prompts that follow vary between browsers.
Follow the prompts. When asked to open or save the file, save it to your
Note: Depending on your browser settings, the file might be saved automatically to a default location on your computer.
The file is added to the I’m Editing view (on the left side of the library). The original file is still in its original location in the library. An icon indicates to users that the file is locked by you for editing.
Now you can open and edit the version you've downloaded.
When you're done, click Upload New Version to upload the edited version to Alfresco Share.
You can click Cancel Editing to unlock the file without making changes.