To add participants to your account, click your profile icon in the top right of the website. From the dropdown, click Manage Account.

From this section, you will see a list of Account Members, and under that Account Invites. Locate the link to "Invite someone to join this account". Clicking that will grant a way for you to enter a participant's email address.

Your participant will get an email titled " Your invitation to join an account." In that email, there will be a link titled "Join Account".

If the participant doesn't have an account they will need to create one. After that, they will have the same privileges as you to perform actions in your account.

If however you only want those participants to have signing privileges then please reference our article on sending out signing requests.