User wish to edit the TM on the fly in the editor but can't since segments are locked by default.
It might be related to the fact that user has no appropriate rights.
Go to "Settings" page by clicking "Settings" on a main page.
Find "Access Rights" section and click "Configure".
Find your user rights,I am selecting "Worker" here but it is only example, you need to find out what rights you have.
There look for the option 95 and enable it.