When your file is locked, it means that you do not have enough minutes to get it transcribed. In that case, you have two options.
Unlock your file by purchasing more hours
Refer for free minutes! On your dashboard, click on 'Start referring' and share the referral link to earn extra minutes free!
How to unlock a file?
When you have enough credit to unlock the rest of the file, you can click on the 'lock' icon on the Status column of the file to unlock it.