Custom approval process for user insertion

Hello!
We want to insert an approval process whenever a user is entered (we don't want an attestation process, but an approval process). We thought about creating a process through the designer in the "process orchestration" section. The example we were inspired by is the process "VI_Attestation_Org_new_AttestationCase_for_Certification", but this is for an attestation process and not for an approval process. 

How can we insert an approval process when a new user is entered?

Version: 8.1.4 (onDemand solution)

Thanks,

Martina