Just as the plan indicates, only 1 person can log in and they can send up to 100 envelopes that need to be signed each year. An envelope can have multiple documents and multiple signers.
If you have several advisors that need to send documents, each one should have their own email address and login in order to send and manage their envelopes. You can set up a plan where you are the administrator and can manage all the users and their envelopes.
Standard and Pro plans include 100 envelopes per user per year. The plan you need depends on which features you require. Standard is $300 per user per year, Pro is $480 per user per year.
You can compare the features of each plan here:
https://ecom.docusign.com/plans-and-pricing/esignature
Regards,
Michael