When editing your subtitles, you might get the following error:

Naturally, you want to change the beginning or end time of your subtitle, but the system doesn’t allow any changes. 

This is because the source and the translation timing are linked, so we can render the source and translated subtitles next to each other. As long as that link is not broken, you can't change the timing.

To break the link, click on the green arrow in the top right corner and click “break link” as shown below.

Now you can fully edit the timing of your subtitles.