How to lock for a track ?

Audacity Audio Track in Red.png

OK, so you have a track with huge amounts of clipping.
What is your question?
What does the title “How to lock for a track” mean?

Hello sorry there was a mistake in the title. I want to know how to unlock the track or timeline area. The red area means the track cannot be edited but I need to edit.

Thanks

No. The red means that the level of the audio is too high and is clipping. See: Audacity Manual