The conference call function on your moto g stylus lets you talk with multiple people simultaneously so up to 6 parties can participate in the same conversation.
Do one of the following:
From the Keypad, enter a 10-digit number then tap the
Call icon

.
From the Contacts tab, select a contact then tap
Call
.
Once the call is connected, tap the
Add call icon

.
Each call must be initiated by call originator.
Enter a 10-digit number then tap the
Call icon
.
As the number or contact is entered, a matching contact may appear and can be selected at any time.
Once the call is connected, tap the
Merge icon

.
To disconnect all calls, tap the
End call icon

(at the bottom).
To disconnect from either party, select
Manage
then tap the
End caller icon

located to the right of the corresponding party.