No changes can be made to a Signed contract. We have no way of unlocking a contract without making your digital signature invalid.
So what can I do?
- Make a copy of the contract
Click on the three dots in the top right corner and choose "copy"
Make your changes, save them and send them to your counterparty for a new signature for your new contract.
Why do I have to get a new signature?
While it you may think of it as "the same contract" as before, changing any details will make it a completely new contract requiring a new signature.
What do I do with the old contract?
Either remove it completely, or add a tag saying something like "Replaced by contract X". You can also add a comment to the old contract with a link to the new contract.