Upon opening a file, Delimit must complete a full file scan before all functions are enabled. 

 

If file scan is still running or if it has been paused, the functions will be grayed-out (disabled) until the scan completes. Make sure to un-pause the scan by un-clicking the Pause button on the top left of the menu. 

 

If file scan has completed, and the functions are still grayed-out, then you have likely edited or modified the file in one way or another, in which case you first need to save the file, to commit the changes, or close the file (without saving) and reopen it, before the functions will be enabled again.