It's very simple. Go to your 'Team settings>Boosters' to activate the eSignature Booster.
You'll get unlimited templates and unlimited documents.
The difference between electronic and digital signatures?
Digital signatures are seen as an equivalent of notarized signatures and require a confirmation from a third-party (The Certificate). They also use SMS authentication.
Most of the time digital and electronic situations are legally binding. You may want to check if your federal legislation has strict requirements related to this.
eSignature solutions supported by Clustdoc
Clustdoc offers both solutions: electronic and digital eSignatures.