No, if you are the party 1 of your contract you can e-sign your contract clicking on the three dots of the right of the contract in the in progress tab.
Yes, you can edit a contract at any time before it is signed. If it has been signed before the mistake has been made you will need to purchase another contract and start again.
Easy, if you click in the contracts located in the “in progress” tab you will see that there are different status for them. The eye symbol means the party has seen the contract, the three dots mean that the contract have been Inverness, The green ...